If a image sheet tile happens to be empty, do not attempt to include it in the consolidation process.
If a image sheet tile happens to be empty, do not attempt to include it in the consolidation process.

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Imported from Google Code.
Original SVN rev#: 287

blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon