Fix response handling for unhandled method calls in flutter_window.cpp

windows/runner/flutter_window.cpp

@@ -98,6 +98,7 @@ bool FlutterWindow::OnCreate() {
         else
           result->Success(flutter::EncodableValue("No Proxy"));
         delete(res);
+        return;
       }
 #ifdef NDEBUG
       else if (call.method_name() == "heartBeat") {
@@ -107,8 +108,10 @@ bool FlutterWindow::OnCreate() {
           }
           lastHeartbeat = std::chrono::steady_clock::now();
           result->Success();
+          return;
       }
 #endif
+      result->Success(); // Default response for unhandled method calls
   });
 
   flutter::EventChannel<> channel2(