Bugfix: Don't try to use editor API when compiling for standalone target.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/SubsurfaceScatteringProfile.cs

             {
                 if (s_DefaultProfile == null)
                 {
+#if UNITY_EDITOR
+#else
+                    throw new UnassignedReferenceException("SubsurfaceScatteringProfile.defaultProfile can not be null.");
+#endif
                 }
                 return s_DefaultProfile;
             }