Handle error when changing the middle of path string in nuxeo-path-suggestion

Reproduce

1. On "add content" dialog
2. On any path, change the middle of it making it invalid
3. No error message will show
4. Pressing create does not result in anything

Expected
When changing the path, if it is invalid, the error message should show up
Fix invalid location not showing if we changed the path to an invalid one in the middle instead of the end of the string