wp_list_categories: term name of 0 not output

[joyously]

Using a term name of '0' is probably a bad idea, but when it is legacy data, that's what you do.

I have a taxonomy called Ratings, with term names of 0, 0.5, 1, 1.5, etc. up to 5. The slugs have the word 'star' in them, like '0-star' and '3-star'.

When using wp_list_categories() to show them all, the one with '0' is not output. Other methods of showing them, such as the menu admin page, the taxonomy admin page, and the tag cloud widget all show the '0' term. If I use the Edit term page, and change the '0' to '0-', it is then output with wp_list_categories().

Somewhere in the function, empty() is causing a problem.

[SergeyBiryukov]

In 43605:

Taxonomy: Make sure wp_list_categories() correctly outputs term name of 0.

Props joyously, SergeyBiryukov.
Fixes #44872.

[SergeyBiryukov]

Reopening for 4.9.9 consideration.

[SergeyBiryukov]

In 43620:

Taxonomy: Make sure wp_list_categories() correctly outputs term name of 0.

Props joyously, SergeyBiryukov.
Merges [43605] to the 4.9 branch.
Fixes #44872.

[pento]

[43605] can be ported to the 5.0 branch.

[43620] needs to be reverted from the 4.9 branch.

[SergeyBiryukov]

In 43711:

Taxonomy: Revert [43620] from the 4.9 branch.

This change is out of the 4.9.x scope, and will be reintroduced in 5.0.x.

See #44872.

[SergeyBiryukov]

In 43712:

Taxonomy: Make sure wp_list_categories() correctly outputs term name of 0.

Props joyously, SergeyBiryukov.
Merges [43605] to the 5.0 branch.
Fixes #44872.