Add _doing_it_wrong() checks if incorrect callback value for apply_filters() #4131
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Add check for the callback function value passed to apply_filters, to determine if the value is empty or not callable. Trigger a _doing_it_wrong() call if an invalid value is passed to make sure the error is not silenced.
Trac ticket: https://core.trac.wordpress.org/ticket/38116
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.