[wp-trac] [WordPress Trac] #54222: Document that the `get_terms` filter can have null for `$taxonomies`

[WordPress Trac]

#54222: Document that the `get_terms` filter can have null for `$taxonomies`
--------------------------+-----------------------------
 Reporter:  dd32          |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Taxonomy      |    Version:
 Severity:  minor         |   Keywords:
  Focuses:  docs          |
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 The `get_terms` filter currently documents that the filter passes an array
 as both the first and second parameters, which is normally true, except
 that the second can be null when not specified.

 The simplest way to trigger this scenario is to query for `get_terms( [
 'term_taxonomy_id' => ?? ] );` which has no taxonomies to pass.

 This can cause PHP Warnings and PHP Fatal errors in code that doesn't
 expect it.

 See some real world examples:
  - https://github.com/WordPress/learn/pull/243
  - https://github.com/Automattic/sensei/pull/4329

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Ticket URL: <https://core.trac.wordpress.org/ticket/54222>
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