Separate testing modification of default and non-default Codelists
Separate testing modification of default and non-default Codelists

When testing populated ones, attempting to add a Codelist that already
exists shouldn't work since it's already added.

This may fix a failing Travis test:
  https://travis-ci.org/IATI/iati.core/jobs/275133960

IATI/iati.core,IATI/iati.core