Sometimes re-loading a file causes functions to not be able to be found

[luketpickering]

import pyNUISANCE as pn
rf = pn.RecordFactory()
hepdata_rec = rf.make_record({"type":"hepdata",
    "recordpath":"/root/software/NUISANCEMC/neutrino_data/data/NOvA/CrossSection/PRL.130.51802/submission-2098257/submission.yaml"})
ana = hepdata_rec.analysis("diffxsec_q2")
ana = hepdata_rec.analysis("diffxsec_q2")

will cause proselecta errors sometimes for the second analysis instantiation talking about missing symbols, even though they exist on the first call. Either loading the same file twice or requesting functions causes issues