Failed check status 12 - [RCB removal_only] diff is empty

[Adal3n3]

CI failure scenarios:

• No explicit target coverage.
• RCB configured is removals_only.
• Diff is empty (no lines removed / no lines added)

PR check status message: Your project check has failed because your HEAD coverage is less than the BASE, you might be missing upload, you have an empty diff. Please check the upload and ensure diff is not empty.

Use-case: Project coverage

User configurable: no