message: fix typo with material pasting
diff: @@ -34,7 +34,7 @@ class AdvancedMaterialEditor
  if (beginsWith(c.second->name(), std::string("map_")))
  newMat->add(c.second);
  else
  - if (!newMat->hasChild(c.second->name()))
  + if (newMat->hasChild(c.second->name()))
  newMat->child(c.second->name()).setValue(c.second->value());
  }
  }
  