Mumps accession parsing throwing an error

[trvrb]

Trying to parse the mumps accession list throws an error. Reproduce by running:

python src/run.py --files input/accessions_mumps.txt --outfile output/mumps.json --pathogen mumps

This produces the following error:

Traceback (most recent call last):
  File "src/run.py", line 95, in <module>
    main(args, logger)
  File "src/run.py", line 75, in main
    dataset.clean_clusters()
  File "/Users/trvrb/Documents/src/sacra/src/dataset.py", line 435, in clean_clusters
    [c.clean() for c in self.clusters]
  File "/Users/trvrb/Documents/src/sacra/src/cluster.py", line 82, in clean
    [unit.fix() for unit in self.get_all_units()]
  File "/Users/trvrb/Documents/src/sacra/src/unit.py", line 27, in fix
    self.fix_single(name)
  File "/Users/trvrb/Documents/src/sacra/src/unit.py", line 22, in fix_single
    setattr(self, name, self.CONFIG["fix_functions"][name](self, None, logger))
  File "src/utils/fix_functions.py", line 29, in sample_name
    obj.fix_single("collection_date")
  File "/Users/trvrb/Documents/src/sacra/src/unit.py", line 22, in fix_single
    setattr(self, name, self.CONFIG["fix_functions"][name](self, None, logger))
  File "src/utils/fix_functions.py", line 67, in collection_date
    if lookups["strain_name_to_date"] is not None and sample.parent.strain_name in lookups["strain_name_to_date"]:
AttributeError: 'Strain' object has no attribute 'strain_name'

I believe we found this before and it relates to Genbank entries that lack strain because the field is called isolate.

accessions_mumps.txt

[barneypotter24]

I believe this issue has the same root as #17, in that there is some variance in the field names provided by genbank that we do not currently account for.