Re-use existing changelog entry
Re-use existing changelog entry

We don't want to create a new changelog entry if the distribution
is set to `UNRELEASED`. This helps in keeping the changelog
cleaner and more meaningful. The distribution will be set by the
`build-multi.sh` script (`A05suffix` hook).

Change-Id: Ia7b4acc213a6266bc755d95691fe1af94321a346

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts