Merge "When the incoming light source is invalid, don\'t generate any shadow" into mnc-dr-dev am: 76d20b4a5c am: 1c7fbe0efb
am: d829ab7683

* commit 'd829ab76831a0c323f669385c54f666f8a91e4f1':
  When the incoming light source is invalid, don't generate any shadow