fix(ngTranslationFilter): angular v1.3.0

src/ngTranslationFilter.js

@@ -13,7 +13,7 @@
 angular.module('ng-translation.filter', [ 'ng-translation.provider' ])
   .filter('translate', ['$parse', '$interpolate', 'ngTranslation', function($parse, $interpolate, ngTranslation) {
 
-    return function(string) {
+    var translateFilter = function(string) {
 
       var args = Array.prototype.slice.call(arguments, 1);
       var funcName = isString(args[0]) ? 'get' : 'getUsed';
@@ -24,13 +24,17 @@ angular.module('ng-translation.filter', [ 'ng-translation.provider' ])
         return res || string;
         //if the first argument is an object
       } else if(isObject(args[0])) {
-        return $interpolate(res)(args[0])
+        return $interpolate(res)(args[0] || {})
       }
       //the first arguments is a string
       //check if it should be interpolate
       return isObject(args[1])
-        ? $interpolate(res)(args[1])
+        ? $interpolate(res)(args[1] || {})
         : res
-    }
+    };
+
+    translateFilter.$stateful = true;
+
+    return translateFilter;
 
   }]);