Merge pull request #391 from mcsdodo/master

allow empty string in directive attribute 'filters'

Author: nervgh

src/module.js

@@ -326,7 +326,7 @@ angular
              * @private
              */
             FileUploader.prototype._getFilters = function(filters) {
-                if (angular.isUndefined(filters)) return this.filters;
+                if (!filters) return this.filters;
                 if (angular.isArray(filters)) return filters;
                 var names = filters.match(/[^\s,]+/g);
                 return this.filters.filter(function(filter) {