Fall back to path that does not use compute shader for ColorGrading in case the shader was stripped.

Author: hkr

PostProcessing/Runtime/Effects/ColorGrading.cs

@@ -176,6 +176,7 @@ public override void Render(PostProcessRenderContext context)
             var gradingMode = settings.gradingMode.value;
             var supportComputeTex3D = SystemInfo.supports3DRenderTextures
                 && SystemInfo.supportsComputeShaders
+                && context.resources.computeShaders.lut3DBaker != null
                 && SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLCore;
 
             if (gradingMode == GradingMode.External)