id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
20603,"Warning error occurs on the default parameter of ""admin-head-callback"" in add_theme_support.",jim912,nacin,"When you make settings of custom header using add_theme_support on functions.php of a theme, if you use default value without defining admin-head-callback, warning error occurs as follows on admin screen of custom header.

{{{
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '' not found or invalid function name in path-to-wordpress-root/wp-includes/plugin.php on line 403
}}}

To fix this, I think better to change default value of admin-head-callback into  `__return_false`, on /wp-includes/theme.php. Here's patch.",defect (bug),closed,high,3.4,Themes,3.4,major,fixed,has-patch,