Check existence of the files before import any playlist.
So.. never more import empty playlists!.
Check NULL string when manipulate lists.
For example, fix that remove library and drop database, when eject any usb mass storage!.
* For these kinds of things I say that the device plugin are beta!!!! haha..
* (But the bug was not on the plugin!) haha..
don't use deprecated GtkArrow

Conflicts:
	src/pragha-sidebar.c