Ref T9458. This is basically the same as D13319, but the "Tags" field didn't get covered in that change.
Specifically, the issue is:
- We try to generate mail to a disabled user (later, we'll drop it without delivering it, but that filtering doesn't happen yet).
- The disabled user doesn't have permission to use Conduit (or any other Conduit-related problem occurs).
- We fail here, then retry generating the mail again later.
Instead, just degrade to not building the field and showing what went wrong.