message: Fix test for empty string.
  Should always be str.empty() instead of str == "".
diff: @@ -2250,7 +2250,7 @@ void UhdmWriter::lateTypedefBinding(UHDM::Serializer& s, DesignComponent* mod,
  }
  }
  - if ((name == "") && (found == false)) {
  + if ((name.empty()) && (found == false)) {
  // Port .op({\op[1] ,\op[0] })
  if (operation* op = any_cast<operation*>(var)) {
  const typespec* baseTypespec = nullptr;
  