EE7.2.2 Throwing Warning on exp:channel:categories With Empty Categories

[dougblackjr]

Description of the problem

Displayed warning after using {exp:channel:categories} tag with debug on:

How To Reproduce
Steps to reproduce the behavior:

1. Create template with {exp:channel:categories} tag.
2. Run loop with an empty category.

For example,

{exp:channel:categories category_group="1"}
        {embed="embeds/category-project-loop" title="{category_name}" cat_id="{category_id}"}
{/exp:channel:categories}

Error Messages

Warning
Undefined variable $all
ee/ExpressionEngine/Addons/channel/mod.channel.php, line 3050

Severity: E_WARNING

Environment Details:

• Version: 7.2.2
• PHP Version 8.0
• MySQL Version : MySQL 8
• OS: Ubuntu
• Web Server: nginx

Possible Solution
On line 3050 of mod.channel.php, either null coalesce $all, or ensure it is set outside of the conditional.

[intoeetive]

@dougblackjr can you clarify what you call "Run loop with an empty category"?

[dougblackjr]

@intoeetive Sure! So, in the template I run this:

{exp:channel:categories category_group="1"}
    {embed="embeds/category-project-loop" title="{category_name}" cat_id="{category_id}"}
{/exp:channel:categories}

I have two categories in this category group that have no entries in them. This is when I get the notice thrown.

If I do this:

{exp:channel:categories category_group="1" show_empty="no"}
    {embed="embeds/category-project-loop" title="{category_name}" cat_id="{category_id}"}
{/exp:channel:categories}

Then the warning disappears.

[intoeetive]

I wasn't able to replicate :(

Is there anything in the embed that might be affecting the output?

[dougblackjr]

@intoeetive Nothing I can see. Here's a video walkthrough: https://www.loom.com/share/c6ae57b78d7149efbf9b1816309ea8d3

[intoeetive]

I think this might be related to the other channel:entries tag in this template. Can you send me the full template code, including the layout template and project-block partial?

[tyssen]

I'm getting the same thing except for me it happens with and without the show_empty parameter. Even in a completely stripped-down template with just this in it, I get the warning:

  {exp:channel:categories
    channel="articles"
    style="nested"
    show_empty="no"
  }
    <a href="{path=articles}/">{category_name}</a>
  {/exp:channel:categories}

The site I'm working on is on EE 7.2.3.

[PDXMan1]

Getting this error also and tested and confirmed it in a stripped-down template.