Handle removed folder when dequeuing local folder scan

NotFound: Could not find doc into WindowsPath('C:/Users/USER/Documents/Nuxeo Drive 2'): ref=WindowsPath('folder/subfolder'), os_path=WindowsPath('//?/C:/Users/USER/Documents/Nuxeo Drive 2/folder/subfolder')
  File "nxdrive\engine\watcher\local_watcher.py", line 237, in _win_dequeue_folder_scan
  File "nxdrive\engine\watcher\local_watcher.py", line 306, in scan_pair
  File "nxdrive\client\local\base.py", line 246, in get_info

Win: dequeuing folder scan error