[wp-trac] [WordPress Trac] #45299: `wpdb->last_result` may not be countable

[WordPress Trac]

#45299: `wpdb->last_result` may not be countable
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 Reporter:  desrosj       |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  5.0
Component:  Query         |    Version:
 Severity:  normal        |   Keywords:  php73 needs-patch
  Focuses:                |
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 In `wpdb->get_col()`, `$wpdb->last_result` may be `null` or an empty
 string, which are uncountable values.

 This can be triggered by passing an empty query string as a query.

 Props @spacedmonkey for pointing this out.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45299>
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