If a bug tracker is configured incorrectly, JIRAClient won't be able to

initialize, and will unhelpfully throw a JSONDecodeError instead of

something more useful. The only place where this manifests is in the bug

infobox (since we otherwise are just creating a link to the bug). The

result of this was that crash e-mails were being sent to the admin

whenever the infobox was triggered (with no visible effect to the user).

Ran unit tests.