the modifications parsing thing didn't allow mzid files missing this data. NOw it does.
Merge branch 'mzid2dbthing' of https://github.com/vitalv/proteopathogen_on_rails

* 'mzid2dbthing' of https://github.com/vitalv/proteopathogen_on_rails:
  the modifications parsing thing didn't allow mzid files missing this data. NOw it does.