filter with null param

core/class/helper.class.php

@@ -333,7 +333,6 @@ class helper {
 	 * @return string
 	 */
 	public static function filter($text, $filter) {
-		$text = trim($text);
 		switch($filter) {
 			case self::FILTER_BOOLEAN:
 				$text = (bool) $text;

core/core.php

@@ -767,7 +767,7 @@ class common {
 			}
 		}
 		// Sinon retourne null
-		return helper::filter(null, $filter);
+		return null;
 	}
 
 	/**