FIX: Variable might not be traversable

htdocs/core/lib/json.lib.php

@@ -218,7 +218,7 @@ if (! function_exists('json_decode'))
  *
  * @param	string	$json		Json encoded to PHP Object or Array
  * @param	bool	$assoc		False return an object, true return an array. Try to always use it with true !
- * @return 	mixed				Object or Array
+ * @return 	mixed				Object or Array or false on error
  */
 function dol_json_decode($json, $assoc=false)
 {