Catch exceptions when parsing invalid json

src/connection.cpp

@@ -384,16 +384,23 @@ void Executor::run()
             emit handleError(response);
         }
     }
+    try {
         auto parsed = json::parse(
             response.toStdString().c_str(),
             nullptr,
             false
         );
+
         if (parsed.is_discarded() || parsed.is_null()) {
             emit handleError(response);
         } else {
             emit responseReady(parsed);
         }
+    } catch (const std::exception& e)  {
+        DEBUG("exception when parsing json: " << e.what() );
+        emit handleError(response);
+    }
+
 }
 
 void Callback::processRPCCallback(json resp)