[gnome-shell] network: don't return null from NMConnectionDevice._getStatus()

[Giovanni Campagna <gcampagna src gnome org>]

commit 5a9f0c24b407a4fddff2ac1a29357a8fc94a4d5e
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Aug 19 23:14:15 2013 +0200

    network: don't return null from NMConnectionDevice._getStatus()
    
    StLabel complains set you set the text to NULL
    
    https://bugzilla.gnome.org/show_bug.cgi?id=706262

 js/ui/status/network.js |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/status/network.js b/js/ui/status/network.js
index 376cb2c..20157f4 100644
--- a/js/ui/status/network.js
+++ b/js/ui/status/network.js
@@ -352,12 +352,12 @@ const NMConnectionDevice = new Lang.Class({
 
     _getStatus: function() {
         if (!this._device)
-            return null;
+            return '';
 
         switch(this._device.state) {
         case NetworkManager.DeviceState.DISCONNECTED:
         case NetworkManager.DeviceState.ACTIVATED:
-            return null;
+            return '';
         case NetworkManager.DeviceState.UNMANAGED:
             /* Translators: this is for network devices that are physically present but are not
                under NetworkManager's control (and thus cannot be used in the menu) */