Don't updateCell with invalid index

Randall Ruderequested to merge
rsquared/kphotoalbum:B_505015_mti into master

CCBUG: 505015

MouseTrackingInteraction remembers the lastFileNameUnderCursor in a static variable. If that thumbnail is no longer in the view, the index will be invalid.

There are several ways to hit this condition. The simplest:

  • start the demo
  • open the thumbnail view
  • left click on a thumbnail and hit the delete key
  • hit enter to delete the file
  • move the mouse over other thumbnails

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