R1:b467e583585c

Fix two minor issues

Summary:
Ref T7811. Fixes two minor issues I observed in the cluster:

- Sometimes APC doesn't give us key names. Not sure exactly what's up here, but we can do a better job with this.
- The `%` in `25%` actually needs more escaping, since it's interpreted by both `pht()` (immediately) and `console_format()` (later).

Test Plan:
- First one is just from an error log, not sure how to repro offhand.
- Ran `bin/phd help start` for the second one.

Reviewers: btrahan

Reviewed By…