fix #11 when path in not in folder list
to reduce overhead as suggested by @FichteFoll https://github.com/SublimeText/SideBarFolders/commit/b18516f1c6f97e01120ab32eb6a33765328cfdc8#sidebarfolders-py-P5
remove brackets
should check if project_data is empty
Merge pull request #13 from randy3k/autofolder

fix #11 when folders in not in project_data