dont kill favicons on feed update

js/app/services/models/feedmodel.coffee

@@ -40,7 +40,7 @@ angular.module('News').factory 'FeedModel',
 			if data.faviconLink == null
 				data.faviconLink = 'url(' +
 					@_utils.imagePath('news', 'rss.svg') + ')'
-			else
+			else if angular.isDefined(data.faviconLink)
 				data.faviconLink = 'url(' + data.faviconLink + ')'
 			###
 			We want to add a feed on the client side before

js/public/app.js

@@ -1602,7 +1602,7 @@ License along with this library.  If not, see <http://www.gnu.org/licenses/>.
           }
           if (data.faviconLink === null) {
             data.faviconLink = 'url(' + this._utils.imagePath('news', 'rss.svg') + ')';
-          } else {
+          } else if (angular.isDefined(data.faviconLink)) {
             data.faviconLink = 'url(' + data.faviconLink + ')';
           }
           /*