[gnome-contacts/new-design] Avoid warnings on row deletion

[Alexander Larsson <alexl src gnome org>]

commit 87f00927360c3d85d59125bee612f20fb92be623
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Dec 14 01:09:36 2011 +0100

    Avoid warnings on row deletion

 src/contacts-contact-pane.vala |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/contacts-contact-pane.vala b/src/contacts-contact-pane.vala
index 03fdfa2..49eb507 100644
--- a/src/contacts-contact-pane.vala
+++ b/src/contacts-contact-pane.vala
@@ -722,8 +722,11 @@ public abstract class Contacts.DataFieldRow : FieldRow {
   }
 
   public void exit_edit_mode (bool save) {
-    var parent_container = (this.get_parent () as Container);
-    parent_container.disconnect (set_focus_child_id);
+    var parent = this.get_parent ();
+    if (parent != null) {
+      var parent_container = (parent as Container);
+      parent_container.disconnect (set_focus_child_id);
+    }
 
     var changed = finish_edit_widgets (save);