[gnome-boxes] topbar: 'status' property now nullable

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit aa99385fc5866cf539beb5491dc28f69de102d60
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Sat Aug 29 23:03:32 2015 +0100

    topbar: 'status' property now nullable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753888

 src/topbar.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/topbar.vala b/src/topbar.vala
index 0f91536..4675ab5 100644
--- a/src/topbar.vala
+++ b/src/topbar.vala
@@ -50,8 +50,8 @@ private class Boxes.Topbar: Gtk.Stack, Boxes.UI {
             collection_toolbar.click_search_button ();
     }
 
-    public string _status;
-    public string status {
+    public string? _status;
+    public string? status {
         get { return _status; }
         set {
             _status = value;