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Add fallback message when preview changelog is empty (#46260)

Avoid publishing preview releasing that say nothing in the release
notes:

<img width="947" height="258" alt="SCR-20260107-ioxx"
src="https://github.com/user-attachments/assets/97204551-8f55-43fb-8c9c-35491a4f1378"
/>

Release Notes:

- N/A *or* Added/Fixed/Improved ...
b41eb6e763Joseph T. Lyons committed on 1/7/2026, 2:24:02 PM· committed by GitHubparent82826e7
1 file changedLine totals unavailable