Fix: filter helpers now accepts non array arguments

fix #7

Author: breadlesscode

Classes/FlowQuery/Operations/FilterByCategoriesOperation.php

@@ -23,7 +23,7 @@ class FilterByCategoriesOperation extends FilterByReferencesOperation
     public function evaluate(FlowQuery $flowQuery, array $arguments)
     {
         if (!is_array($arguments[0])) {
-            throw new FlowQueryException('The first parameter of '.self::$shortName.' should be an array');
+            $arguments[1] = [ $arguments[1] ];
         }
 
         $context = \array_filter($flowQuery->getContext(), $this->getReferenceFilter('categories', $arguments[0]));

Classes/FlowQuery/Operations/FilterByTagsOperation.php

@@ -23,7 +23,7 @@ class FilterByTagsOperation extends FilterByReferencesOperation
     public function evaluate(FlowQuery $flowQuery, array $arguments)
     {
         if (!is_array($arguments[0])) {
-            throw new FlowQueryException('The first parameter of '.self::$shortName.' should be an array');
+            $arguments[1] = [ $arguments[1] ];
         }
 
         $context = \array_filter($flowQuery->getContext(), $this->getReferenceFilter('tags', $arguments[0]));