Only update saved_data if the chart could be saved

src/ag-header-bar.vala

@@ -1,13 +0,0 @@
-namespace Ag {
-
-    class HeaderBar: Gtk.HeaderBar {
-        public void clear()
-        {
-            custom_title = null;
-
-            foreach (Gtk.Widget w in get_children()) {
-                w.hide();
-            }
-        }
-    }
-}

src/ag-window.c

@@ -1120,10 +1120,10 @@ ag_window_save_action(GSimpleAction *action,
                     _("Unable to save: %s"),
                     err->message
                 );
+        } else {
+            ag_db_chart_save_unref(priv->saved_data);
+            priv->saved_data = save_data;
         }
-
-        ag_db_chart_save_unref(priv->saved_data);
-        priv->saved_data = save_data;
     }
 }
 

src/widgets.vala

@@ -1,13 +0,0 @@
-namespace Ag {
-
-    public class HeaderBar : Gtk.HeaderBar {
-        public void clear()
-        {
-            custom_title = null;
-
-            foreach (Gtk.Widget w in get_children()) {
-                w.hide();
-            }
-        }
-    }
-}