ATLASG-1539: Fixes for missing b-tagging info in trackless jets
This fixes some problems we've seen in ATLASG-1539. The underlying issue was that quite a lot of information was added conditionally, i.e. if no jet fitter vertices were present in a jet, lots of JetFitter information wasn't added. This was "fine" so long as one jet in the event got the information (the rest of the auxdata just became some undefined default), but if every jet in the event had the same issue downstream code will crash.
This should also fix the longstanding issues we had in ATLASRECTS-5027.
Edited by Dan Guest