--warning

Fix annoying warning when connecting to a nullptr emitter

libdiscover/resources/ResourcesModel.cpp

@@ -134,8 +134,10 @@ void ResourcesModel::addResourcesBackend(AbstractResourcesBackend* backend)
     connect(backend, &AbstractResourcesBackend::fetchingUpdatesProgressChanged, this, [this] { m_fetchingUpdatesProgress.reevaluate(); });
     connect(backend, &AbstractResourcesBackend::resourceRemoved, this, &ResourcesModel::resourceRemoved);
     connect(backend, &AbstractResourcesBackend::passiveMessage, this, &ResourcesModel::passiveMessage);
-    connect(backend->reviewsBackend(), &AbstractReviewsBackend::error, this, &ResourcesModel::passiveMessage, Qt::UniqueConnection);
     connect(backend->backendUpdater(), &AbstractBackendUpdater::progressingChanged, this, &ResourcesModel::slotFetching);
+    if (backend->reviewsBackend()) {
+        connect(backend->reviewsBackend(), &AbstractReviewsBackend::error, this, &ResourcesModel::passiveMessage, Qt::UniqueConnection);
+    }
 
     // In case this is in fact the first backend to be added, and also happens to be
     // pre-filled, we still need for the rest of the backends to be added before trying