* @returns {$.Deferred} switching end signal
*/
on_prev_view: function (options) {
+ options = options || {};
var current_view = this.views_history.pop();
var previous_view = this.views_history[this.views_history.length - 1] || options['default'];
if (options.created && current_view === 'form' && previous_view === 'list') {