Avoid UI clash between changed repos and empty update

src/org/fdroid/fdroid/FDroid.java

@@ -135,12 +135,12 @@ public class FDroid extends TabActivity implements OnItemClickListener,
             }
         }
 
+        triedEmptyUpdate = false;
     }
 
     @Override
     protected void onStart() {
         super.onStart();
-        triedEmptyUpdate = false;
         populateLists(true);
     }
 
@@ -231,6 +231,7 @@ public class FDroid extends TabActivity implements OnItemClickListener,
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 
+        triedEmptyUpdate = true;
         switch (requestCode) {
         case REQUEST_APPDETAILS:
             break;
@@ -260,10 +261,8 @@ public class FDroid extends TabActivity implements OnItemClickListener,
             break;
         case REQUEST_PREFS:
             // The automatic update settings may have changed, so reschedule (or
-            // unschedule) the
+            // unschedule) the service accordingly. It's cheap, so no need to
-            // service accordingly. It's cheap, so no need to check if the
+            // check if the particular setting has actually been changed.
-            // particular setting has
-            // actually been changed.
             UpdateService.schedule(getBaseContext());
             break;