Fix GoniometricLight::Power() to not crash when MIPMap pointer is NULL.
Fix GoniometricLight::Power() to not crash when MIPMap pointer is NULL.
patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin,patwonder/pbrt-v2-skin