Fix crash when no emails received yet

src/views/email.js

@@ -702,7 +702,7 @@ angular.module('Application').controller('EmailController', ['$scope', '$locatio
 
                     var u = $scope.diskUsage[m.name + '@' + m.domain]; // this is unset when no emails have been received yet
                     m.usage = (u && u.quotaValue * 1024) || 0;
-                    m.limit = u.quotaLimit * 1024;
+                    m.limit = (u && u.quotaLimit * 1024) || 0;
                 });
 
                 $scope.mailboxes.mailboxes = mailboxes;