fix(templateCache): make sure $state is passed config options before checking what they are

Author: perrygovier

Diff for: js/angular/service/templateCache.js

@@ -101,7 +101,7 @@ function($stateProvider, $ionicConfigProvider) {
   var stateProviderState = $stateProvider.state;
   $stateProvider.state = function(stateName, definition) {
     // don't even bother if it's disabled. note, another config may run after this, so it's not a catch-all
-    if($ionicConfigProvider.prefetchTemplates() !== false){
+    if(typeof definition === 'object' && $ionicConfigProvider.prefetchTemplates() !== false){
       var enabled = definition.prefetchTemplate !== false;
       if(enabled && isString(definition.templateUrl))templatesToCache.push(definition.templateUrl);
       if(angular.isObject(definition.views)){