diff -r a1234ceba912 -r 5f038a505cd7 Model/Tag.php
--- a/Model/Tag.php	Fri Oct 21 19:22:06 2011 +0200
+++ b/Model/Tag.php	Mon Oct 24 18:45:34 2011 +0200
@@ -302,5 +302,14 @@
         return $this->category;
     }
     
+    /**
+     * Set category to Null
+     *
+     */
+    function nullCategory()
+    {
+        return $this->setCategory(NULL);
+    }
+    
      
  }
\ No newline at end of file