Assimp fails on Symbian For Some Models

Some models fail to load on Symbian, resulting in application crashes.

This seems to occur for models with multiple textures/materials. Objects with a single material seem to work fine, though this could be a coincidence of the test set.

The problem is localised to the ApplyPostProcessing step of file processing (Importer.cpp). Removal of this step fixes the problem, but at unknown cost.