Fixed blinking of no messages text

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -2909,6 +2909,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         public void onLoading() {
             loading = true;
             pbWait.setVisibility(View.VISIBLE);
+            if (viewType == AdapterMessage.ViewType.SEARCH)
                 tvNoEmail.setVisibility(View.GONE);
         }