message: Fix "no texture bound" warnings in WebGL.
diff: @@ -187,6 +187,9 @@ MaterialInstance* UbershaderLoader::createMaterialInstance(MaterialKey* config,
  mi->setParameter("metallicRoughnessMap", mDummyTexture, sampler);
  mi->setParameter("occlusionMap", mDummyTexture, sampler);
  mi->setParameter("emissiveMap", mDummyTexture, sampler);
  + mi->setParameter("clearCoatMap", mDummyTexture, sampler);
  + mi->setParameter("clearCoatRoughnessMap", mDummyTexture, sampler);
  + mi->setParameter("clearCoatNormalMap", mDummyTexture, sampler);
  #endif
  return mi;
  