Quy

RTCThis comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42386.

Duplicate #38404?

I don't know if it matters that the return format is different when no values. Before PR (returns JSON): ``` "myfields": { "": null }, "radio": { "": null }...

I have tested this item :white_check_mark: successfully on 125143e1467004884d98ac32501d5ca0867562ccThis comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/38781.

RTCThis comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/38781.

Maybe add a legend in the footer similar to Permissions. 

Installed Blog Sample Data. Created a Archived Articles menu item. Go to the frontend. 

Before PR:  After PR: 

Please close this issue if it is a duplicate of #43543.

Reported to https://github.com/joomla/Manual/issues/230