fix(grpc_BS):fix yaml load exception processing

src/driver/driver_cloud_grpc_client_BS/main.cpp

@@ -30,9 +30,16 @@ void dec_yaml(const char * stryamlpath)
     {
         config = YAML::LoadFile(stryamlpath);
     }
-    catch(...)
+    catch(YAML::BadFile &e)
     {
-        qDebug("yaml file has some unknown characters or load fail.");
+        std::cout<<e.what()<<std::endl;
+        qDebug("yaml file load fail.");
+        return;
+    }
+    catch(YAML::ParserException &e)
+    {
+        std::cout<<e.what()<<std::endl;
+        qDebug("yaml file is malformed.");
         return;
     }