Fix bug 89324 (Juk crashes guessing tags in a tree view folder with only one item).
I hacked around it by preventing the tree view mode playlists from being deleted while guessing the tags. Note that you can still conceivably cause this crash by guessing the tag using the Internet in some rare cases. CCMAIL:firstname.lastname@example.org svn path=/trunk/kdemultimedia/juk/; revision=346642
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