[recipes] Don't show an empty shopping list

[Matthias Clasen <matthiasc src gnome org>]

commit ad46df49438b9778f9df86ac2ea52ee7070b5003
Author: Ekta Nandwani <mailnandwaniekta gmail com>
Date:   Sat Mar 4 11:08:44 2017 +0530

    Don't show an empty shopping list
    
    Leave the shopping page and go back to the home page
    when the last recipe is removed from the shopping list.
    This matches the behavior of the "Clear List" button.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779532

 src/gr-shopping-page.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/gr-shopping-page.c b/src/gr-shopping-page.c
index b1e5411..ab0caaa 100644
--- a/src/gr-shopping-page.c
+++ b/src/gr-shopping-page.c
@@ -110,11 +110,12 @@ recount_recipes (GrShoppingPage *page)
         GList *children;
         int count;
         g_autofree char *tmp = NULL;
-
+        GtkWidget *window;
+        
         children = gtk_container_get_children (GTK_CONTAINER (page->recipe_list));
         count = g_list_length (children);
         g_list_free (children);
-
+        
         g_free (page->title);
         page->title = g_strdup_printf (ngettext ("Buy Ingredients (%d recipe)",
                                                  "Buy Ingredients (%d recipes)", page->recipe_count),
@@ -125,6 +126,10 @@ recount_recipes (GrShoppingPage *page)
                                          "%d Recipes marked for preparation", count),
                                count);
         gtk_label_set_label (GTK_LABEL (page->recipe_count_label), tmp);
+        if (count == 0) {
+                window = gtk_widget_get_ancestor (GTK_WIDGET (page), GTK_TYPE_APPLICATION_WINDOW);
+                gr_window_go_back (GR_WINDOW (window));
+        }
 }
 
 typedef struct {