message: Logging: Do not print message if there is none
diff: @@ -116,7 +116,12 @@ void DefaultLogger::log(v_uint32 priority, const std::string& tag, const std::st
  if (indent) {
  std::cout << "|";
  }
  +
  + if (message.empty()) {
  + std::cout << " " << tag << std::endl;
  + } else {
  std::cout << " " << tag << ":" << message << std::endl;
  + }
  }
  @@ -295,7 +300,7 @@ void Environment::logFormatted(v_int32 priority, const std::string& tag, const c
  }
  // if we dont need to format anything, just print the message
  if(message == nullptr) {
  - log(priority, tag, "[null]");
  + log(priority, tag, std::string());
  return;
  }
  // check how big our buffer has to be
  