Comment 2 for bug 536797

This probably falls under a wider existing bug, but this is a very specific problem: two pages that oops out as I try to integration-test our buildfarm work. It's easy enough to make them not oops out, even if that doesn't change the fact that UI needs fixing.

AFAICS a minimal, ugly fix that would let me continue my work would involve:
 * Providing a "build" property in BuildFarmJob, defaulting to None.
 * Making the first part of builder-index.pt that depends on job/specific_job/build conditional on there being one.
 * Making the second part, which shows the logs, conditional on something else than the user's viewing rights for the build (or bypassing the access check for buildless jobs).