RefreshCollectionsWorker causes app to crash when the service is invalid

[sunkup]

Purpose

This fixes an app crash, caused by previously thrown IllegealArgumentException on invalid service IDs.

Short description

Gracefully handle refresh requests with invalid service IDs by not running the RefreshCollectionsWorker at all, instead of throwing an IllegalArgumentException which caused the crash.

Checklist

• [X] The PR has a proper title, description and label.
• [x] I have self-reviewed the PR.
• [X] I have added documentation to complex functions and functions that can be used by other modules.
• [X] I have added reasonable tests or consciously decided to not add tests.