When there are no addons listed in the Addon Manager

Help User Manual
1

Check the Projects tab in the Edit → Addon Manager. If none of the Project checkboxes are selected, that is the message that would appear in the in the Addons tab.

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Also, check that the filter text box is blank and and all the pull-down filter selection are at the top menu choice.
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Select at least the default 1st row checkbox and click the Refresh button.
(Also of interest but not related to your issue: To turn off default filtering entirely, changed from “Everyone” to “All audiences” and from “stable” to “All statuses”)

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2

If no addons are listed after verifying the Projects and Filters are set correctly, there might have been a problem when generating the Addonlist- xx .json file generated after updating the collection on GitHub.

Inspect the https://raw.githubusercontent.com/gramps-project/addons/master/gramps52/listings/addons-en.json (or fill in the language code if you’re not running the English version) and see if the file is intact on the server.

If it looks like there’s a problem, let us know.