Do not check for plugin updates when there are no plugins

[jom]

Changes Proposed in this Pull Request

• Only sends plugin update requests when there are first-party plugins installed

Testing Instructions

• Install Query Monitor. Test with no other WPJM plugins installed (activated or not).
• Clear all network/site transients.
• Ensure requests aren't made to https://wpjobmanager.com/wp-json/wpjmcom-licensing/v1/updates
• Add a first party add on.
• Observe a request is made to the /updates endpoint.

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Plugin build for 678169c
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[fjorgemota]

The code looks good, but, where (e.g. on which pages) should this code be running?

I see that on the /wp-admin/update-core.php?force-check=1 page the update_plugins transient is being updated, but it doesn't seem to be triggering the hook pre_set_site_transient_update_plugins, although the addon is correctly appearing on the list of plugins to be updated... 🤔

Testing on PHP 8.2.10 and WP 6.3.1

[fjorgemota]

Nevermind the comment above, I just found out that wp transient delete --all deletes only the site transients, while the ones used by this algorithm are related to the "network", so we need to run wp transient delete --network --all instead.

And the weird thing is that I'm testing on a non-multisite WP installation, but oh well. I'll test further and update the review =)

[fjorgemota]

Looks good and works well!

[jom]

Thanks, @fjorgemota!