[libhandy] preferences-group: Exclude untitled rows from search

[Alexander Mikhaylenko <alexm src gnome org>]

commit ac7574bebcc51288288b6ef23d9cc272b876a537
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Wed Jul 29 19:46:29 2020 +0200

    preferences-group: Exclude untitled rows from search
    
    While they would be searchable via their subtitle, they would be visible
    as empty in the search, presenting their page as the only useful
    information, which isn't enough, so just ignore them.

 src/hdy-preferences-group.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/hdy-preferences-group.c b/src/hdy-preferences-group.c
index 82c6d788..80006274 100644
--- a/src/hdy-preferences-group.c
+++ b/src/hdy-preferences-group.c
@@ -408,12 +408,19 @@ static void
 add_preferences_to_model (HdyPreferencesRow *row,
                           GListStore        *model)
 {
+  const gchar *title;
+
   g_assert (HDY_IS_PREFERENCES_ROW (row));
   g_assert (G_IS_LIST_STORE (model));
 
   if (!gtk_widget_get_visible (GTK_WIDGET (row)))
     return;
 
+  title = hdy_preferences_row_get_title (row);
+
+  if (!title || !*title)
+    return;
+
   g_list_store_append (model, row);
 }