message: don't output extra newlines if not necessary
diff: @@ -315,9 +315,11 @@ namespace ospray {
  ErrorMsgStream::~ErrorMsgStream()
  {
  + if (!msg.str().empty()) {
  msg << std::endl;
  postErrorMsg(msg, logLevel);
  }
  + }
  ErrorMsgStream postErrorMsg(uint32_t postAtLogLevel)
  {
  