Revert changes to viewExtent. Move check for zero vector sooner and adjust if needed.
Revert changes to viewExtent. Move check for zero vector sooner and adjust if needed.

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