desrosj 945ba795dc WPDB: Check that $wpdb->last_result is countable before counting with it. ...

`wpdb::get_col()` iterates over `$wpdb->last_result`, which can be a non-countable value, should the preceding query have failed.

Props spacedmonkey, desrosj, pento.

Merges [43934] into trunk.

See #45299.
Built from https://develop.svn.wordpress.org/trunk@44272


git-svn-id: http://core.svn.wordpress.org/trunk@44102 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2018-12-17 18:39:52 +00:00

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