Error listing identifiers for metadata format IDIOM_METS

HTTPError: 500 Server Error: for url: http://textgridlab.org/1.0/tgoaipmh/oai?verb=ListIdentifiers&resumptionToken=DnF1ZXJ5VGhlbkZldGNoBQAAAAAAP-9hFkVsT1RObm1fUkZLUWRVOWE4cmFOdUEAAAAAAD_vXxZFbE9UTm5tX1JGS1FkVTlhOHJhTnVBAAAAAAA_72IWRWxPVE5ubV9SRktRZFU5YThyYU51QQAAAAAAP_BcFkMxbHhCazNPU0NtenpWNzJYY1VOS1EAAAAAAD_vYBZFbE9UTm5tX1JGS1FkVTlhOHJhTnVB

Junit online test also fails: testListIdentifiersIDIOMMETSAllPages with that error

added tg-oaipmh label

assigned to @sfunk

created branch 64-error-listing-identifiers-for-metadata-format-idiom_mets to address this issue

mentioned in commit 1bf33908

mentioned in commit 5d7c56dc

mentioned in commit 1edcd05f

mentioned in commit bf09e7de

mentioned in commit 14653a89

mentioned in commit bfea7758

mentioned in commit 9a969163

added classicmayan label