MPDroid: Add some helpful Android annotations.
QueueFragment: Cleanup the QueueAdapter.
SeparatedListAdapter: Cleanup warnings.
adapters: Cleanup ArrayAdapter & ArrayIndexAdapter warnings.
Item: Fix a few potential null pointers.
SearchActivity: Small fixes.
SearchActivity: Fix a few potential NPEs.
MPD: Fix album artist fixing, version #2.

The last version fixed some bugs, created others.