Remove incorrect undefined check.  The shaders in the storage object can never be undefined anyway.
Remove incorrect undefined check.  The shaders in the storage object can never be undefined anyway.

wallw-bits/cesium,likangning93/cesium,omh1280/cesium,hodbauer/cesium,jason-crow/cesium,ggetz/cesium,emackey/cesium,aelatgt/cesium,likangning93/cesium,jason-crow/cesium,esraerik/cesium,progsung/cesium,emackey/cesium,YonatanKra/cesium,jasonbeverage/cesium,jason-crow/cesium,CesiumGS/cesium,likangning93/cesium,kaktus40/cesium,likangning93/cesium,kaktus40/cesium,esraerik/cesium,kiselev-dv/cesium,geoscan/cesium,oterral/cesium,emackey/cesium,jasonbeverage/cesium,hodbauer/cesium,esraerik/cesium,AnimatedRNG/cesium,ggetz/cesium,CesiumGS/cesium,denverpierce/cesium,kiselev-dv/cesium,omh1280/cesium,AnimatedRNG/cesium,wallw-bits/cesium,likangning93/cesium,CesiumGS/cesium,ggetz/cesium,YonatanKra/cesium,jason-crow/cesium,YonatanKra/cesium,kiselev-dv/cesium,oterral/cesium,kiselev-dv/cesium,AnimatedRNG/cesium,soceur/cesium,CesiumGS/cesium,AnimatedRNG/cesium,wallw-bits/cesium,omh1280/cesium,progsung/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,aelatgt/cesium,geoscan/cesium,denverpierce/cesium,esraerik/cesium,aelatgt/cesium,NaderCHASER/cesium,soceur/cesium,josh-bernstein/cesium,denverpierce/cesium,NaderCHASER/cesium,wallw-bits/cesium,YonatanKra/cesium,emackey/cesium,ggetz/cesium,hodbauer/cesium,josh-bernstein/cesium,denverpierce/cesium,omh1280/cesium,aelatgt/cesium,soceur/cesium,oterral/cesium,NaderCHASER/cesium,AnalyticalGraphicsInc/cesium