message: fix metadata encoding description not deleting
diff: @@ -803,6 +803,8 @@ void ACesium3DTileset::LoadTileset() {
  this->_encodedMetadataDescription = {
  pEncodedMetadataDescriptionComponent->FeatureTables,
  pEncodedMetadataDescriptionComponent->FeatureTextures};
  + } else {
  + this->_encodedMetadataDescription = {};
  }
  ACesiumCreditSystem* pCreditSystem = this->ResolveCreditSystem();
  