translate_level_to_role may return void in wp-admin/includes/upgrade.php

[diddledani]

The function translate_level_to_role() is defined and used in wp-admin/includes/upgrade.php in the function upgrade_160. The usage requires that the function return a string or numeric to be used in a subsequent array key. The function may return void which cannot be used as a key. For correctness the function should always return a value. Patch attached adds a default selector to the switch statement to achieve this.

[diddledani]

patch to fix potentially returning void in translate_level_to_role() in upgrade.php

[SergeyBiryukov]

In 45747:

Upgrade/Install: Make sure translate_level_to_role() always returns a value.

Props diddledan.
Fixes #46848.