allow tcp request with no dest, auto query topic.

lichao

2021-06-04 903b27f875e5f2a872c1b309f354b18c0450f35a

 src/shm.h

@@ -115,7 +115,7 @@
      default: break;
      }
      if (!IsOk()) {
         throw("Error: shm can not create/open \"" + name_ + "\"");
         throw std::runtime_error("Error: shm can not create/open \"" + name_ + "\"");
      }
   }