[FIX] Prevent the engine throwing an exception on startup if the anisotropic filter extension is not available.
[FIX] Prevent the engine throwing an exception on startup if the anisotropic filter extension is not available.

shinate/engine,SuperStarPL/engine,horryq/engine-1,3DGEOM/engine,sanyaade-teachings/engine,guycalledfrank/engine,SuperStarPL/engine,RainsSoft/engine,playcanvas/engine,nizihabi/engine,aidinabedi/playcanvas-engine,sanyaade-teachings/engine,H1Gdev/engine,horryq/engine-1,MicroWorldwide/PlayCanvas,RainsSoft/engine,guycalledfrank/engine,horryq/engine-1,maxwellalive/engine,maxwellalive/engine,nizihabi/engine,sereepap2029/playcanvas,3DGEOM/engine,shinate/engine,sanyaade-teachings/engine,playcanvas/engine,maxwellalive/engine,sereepap2029/playcanvas,shinate/engine,H1Gdev/engine,RainsSoft/engine,MicroWorldwide/PlayCanvas,SuperStarPL/engine,3DGEOM/engine,sereepap2029/playcanvas,nizihabi/engine,aidinabedi/playcanvas-engine