Description:

If a plugin has no category with less than 4 reports, the widget menu code will end up creating a Category with no reports in the widget selector:

vs.

This PR avoids creating empty categories.

Should probably be replicated on 4.x-dev after merging.

Review

• Functional review done
• Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed