ca97e6751163fb35ec7747d4394473dfe8eeebb0
Always check the return value of "findDataFile". If it's empty, always
provide the _original_ path being searched in an error message. Otherwise
we eventually just get useless 'Can't find file "".' error messages
(and also a segfault here, since osgDB::readImageFile("") returns NULL).
[ Nothing here at this time. ]
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