Backport done in accordance with the RC1 tagging announcement which says that the only changes
to 4.1 should go into final now.

This fixes a known crash and is not dangerous.  The code removed is intended to prevent a
deleted playlist from remaining selected and causing crashes later.  However the only way to
remove a playlist which can be selected is to do so from the PlaylistBox::remove() function,
which handles this case already in a better fashion.  Leaving the code in risks crashes on JuK
shutdown if the playlist is removed after the CollectionList is deleted.

BUG:165660

svn path=/branches/KDE/4.1/kdemultimedia/juk/; revision=830198