Scott Taylor 3fb283db0a Add 2 noop methods to WP_List_Table: ->column_default() and ->column_cb().
`WP_List_Table` is essentially an `abstract` class. Some of its methods throw `die()` warnings if they aren't overridden in a child class.

These noop methods wouldn't be `abstract`, because they are not required in subclasses. However, `WP_List_Table` can call these methods in its own method, `->single_row_columns()`, whether a subclass defined them or not.

See #30799.

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git-svn-id: http://core.svn.wordpress.org/trunk@31191 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-01-16 17:42:22 +00:00
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2014-12-20 21:10:24 +00:00