This updates the jet reconstruction config to support running with no primary vertex container (e.g. for cosmics). Following a discussion in SW Coordination, it was decided that this should be supported rather than simply turning off jet reconstruction for this type of event. This should resolve ATLASRECTS-5519.
Rather than adjusting any C++ code, I've done this entirely by modifying the python config such that no tools which require a PV container (JVT, cluster origin corrections, etc.) are scheduled in the first place. I've tested this locally with q220 (cosmics) and found that it fixes the errors that currently exist there.
Tagging @khoo, @sawyer, @sschramm, @cdelitzs for their awareness.