When called without the $meta_value parameter, bb_delete_usermeta() does not work.

[mdawaffe]

bb_delete_usermeta() can either be called with an explicit meta_value (to delete the key with that value) or without (to delete the key no matter the value). When called without an explicit meta_value, the function fails.

bb_delete_usermeta()'s $meta_value parameter defaults to the empty string, but BackPress' WP_User::delete_meta() checks is_null( $meta_value ).

Attached changes the default to null.

[johnjamesjacoby]

Fixed in r2910.