Description:

The Referrers.getAll API does not yet support requests for multiple sites or periods. We therefor had implemented a check if multiple sites are requests. In the very special case, that all is provided as idSite, but the user only has access to exactly one site, that check currently fails and the API tries to render an unsupported map, causing an error.

fixes #20339

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