Sanity check

Not sure this can really happen in real life (happens because I was playing with
    the code and end up having "=true" line in Clementine.conf) but FWIW, better
to check those values they come from possibly corrupted files/preferences.

src/internet/core/internetmodel.cpp

@@ -347,8 +347,11 @@ void InternetModel::UpdateServices() {
 
   QStringList keys = s.childKeys();
 
-  for (QString service_name : keys) {
+  for (const QString& service_name : keys) {
     InternetService* internet_service = ServiceByName(service_name);
+    if (internet_service == nullptr) {
+      continue;
+    }
     bool setting_val = s.value(service_name).toBool();
 
     // Only update if values are different