See PHI1745. This callsite for "ChangesetParser" was not properly updated for recent changes.
- Set metamta.differential.inline-patches to 100.
- Created a new revision with a small (<100 line) diff, with at least one reviewer.
- Ran bin/phd debug and observed outbound mail queue with bin/mail list-outbound.
- Before: fatal when trying to generate the inline changes for mail.
- After: clean mail generation.