Merge "When the incoming light source is invalid, don\'t generate any shadow" into mnc-dr-dev am: 76d20b4a5c am: 1c7fbe0efb am: d829ab7683
am: dfaf23f846

* commit 'dfaf23f84669b2f45da892f49b2d8c07f161f7a2':
  When the incoming light source is invalid, don't generate any shadow