[macOS] Fix 'NSError' object has no attribute 'utf8ValueSafe'

self = <tests.old_functional.test_special_characters.TestSpecialCharacters testMethod=test_rename_local>

    @not_windows(reason="Explorer prevents using those characters")
    def test_rename_local(self):
        local = self.local_1
        remote = self.remote_1
    
        self.engine_1.start()
        self.wait_sync(wait_for_async=True)
    
        folder_name = "abcd"
        file_name = "efgh.txt"
        folder = local.make_folder("/", folder_name)
        local.make_file(folder, file_name, content=b"This is a test file")
    
        self.wait_sync()
        assert remote.exists(f"/{folder_name}")
        assert remote.exists(f"/{folder_name}/{file_name}")
    
        new_folder_name = "/ * ? < > |"
        new_folder_name_expected = "- - - - - -"
        new_file_name = "| > < ? * /.txt"
        new_file_name_expected = "- - - - - -.txt"
>       local.rename(f"/{folder_name}", new_folder_name)

file_name  = 'efgh.txt'
folder     = PosixPath('abcd')
folder_name = 'abcd'
local      = <MacLocalClient base_folder=PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643'), is_case_sensitive=None>
new_file_name = '| > < ? * /.txt'
new_file_name_expected = '- - - - - -.txt'
new_folder_name = '/ * ? < > |'
new_folder_name_expected = '- - - - - -'
remote     = <RemoteBase args=None, kwargs=None, upload_tmp_dir=PosixPath('/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/uploads')>
self       = <tests.old_functional.test_special_characters.TestSpecialCharacters testMethod=test_rename_local>

tests/old_functional/test_special_characters.py:63: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <MacLocalClient base_folder=PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643'), is_case_sensitive=None>
srcref = '/abcd', to_name = '/ * ? < > |'

    def rename(self, srcref: str, to_name: str):
        parent = os.path.dirname(srcref)
        dstref = os.path.join(parent)
>       self.move(srcref, dstref, name=to_name)

dstref     = '/'
parent     = '/'
self       = <MacLocalClient base_folder=PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643'), is_case_sensitive=None>
srcref     = '/abcd'
to_name    = '/ * ? < > |'

tests/old_functional/local_client_darwin.py:52: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <MacLocalClient base_folder=PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643'), is_case_sensitive=None>
srcref = '/abcd', parentref = '/', name = '/ * ? < > |'

    def move(self, srcref: str, parentref: str, name: str = None) -> None:
        src = self.abspath(srcref)
        parent = self.abspath(parentref)
    
        dst = parent / (name or src.name)
    
        error = None
        result = self.fm.moveItemAtPath_toPath_error_(str(src), str(dst), error)
        time.sleep(0.3)
>       self._process_result(result)

dst        = PosixPath('/ * ? < > |')
error      = None
name       = '/ * ? < > |'
parent     = PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643')
parentref  = '/'
result     = (False,
 Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSDestinationFilePath=/ * ? < > |, NSUserStringVariant=Move, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d77ff0 {Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSSourceFilePathErrorKey=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUserStringVariant=(
    Copy
), NSDestinationFilePath=/ * ? < > |, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d74a10 {Error Domain=NSPOSIXErrorDomain Code=30 "Read-only file system"}}}})
self       = <MacLocalClient base_folder=PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643'), is_case_sensitive=None>
src        = PosixPath('/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd')
srcref     = '/abcd'

tests/old_functional/local_client_darwin.py:47: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

result = (False, Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is ...rwin-16643/abcd, NSUnderlyingError=0x7fc3d9d74a10 {Error Domain=NSPOSIXErrorDomain Code=30 "Read-only file system"}}}})

    @staticmethod
    def _process_result(result):
        ok, err = result
        if not ok:
>           raise OSError(err.utf8ValueSafe())
E           AttributeError: 'NSError' object has no attribute 'utf8ValueSafe'

err        = Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSDestinationFilePath=/ * ? < > |, NSUserStringVariant=Move, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d77ff0 {Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSSourceFilePathErrorKey=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUserStringVariant=(
    Copy
), NSDestinationFilePath=/ * ? < > |, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d74a10 {Error Domain=NSPOSIXErrorDomain Code=30 "Read-only file system"}}}}
ok         = False
result     = (False,
 Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSDestinationFilePath=/ * ? < > |, NSUserStringVariant=Move, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d77ff0 {Error Domain=NSCocoaErrorDomain Code=642 "You can’t save the file “abcd” because the volume “Macintosh HD” is read only." UserInfo={NSSourceFilePathErrorKey=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUserStringVariant=(
    Copy
), NSDestinationFilePath=/ * ? < > |, NSFilePath=/private/var/folders/b6/t8dzh1094157tl2364wnb1jh0000gn/T/1bd58717/1/drive/test_rename_local-darwin-16643/abcd, NSUnderlyingError=0x7fc3d9d74a10 {Error Domain=NSPOSIXErrorDomain Code=30 "Read-only file system"}}}})

tests/old_functional/local_client_darwin.py:65: AttributeError

AttributeError: 'NSError' object has no attribute 'utf8ValueSafe'