Bug 775051 - Make sure there is a valid url before attempting to add perms for it, r=philikon

b2g/chrome/content/shell.js

@@ -58,14 +58,17 @@ function addPermissions(urls) {
     'content-camera', 'webcontacts-manage', 'wifi-manage', 'desktop-notification',
     'geolocation', 'device-storage', 'alarms'
   ];
+
   urls.forEach(function(url) {
     url = url.trim();
+    if (url) {
       let uri = Services.io.newURI(url, null, null);
       let allow = Ci.nsIPermissionManager.ALLOW_ACTION;
 
       permissions.forEach(function(permission) {
         Services.perms.add(uri, permission, allow);
       });
+    }
   });
 }