Bugfix: control IntegrityError and AssertionError

[marblestation]

Control exceptions that stop processing the rest of the batch. Examples:

• AssertionError("identifier: multiple data-types in list: [u'2021MNRAS.500.4277J', u'2020MNRAS.tmp.3315J', u'10.1093/mnras/staa3476', u'2020arXiv200911251J', None]",)
• IntegrityError('(psycopg2.errors.UniqueViolation) duplicate key value violates unique constraint "records_bibcode_key"\nDETAIL: Key (bibcode)=(2020PhyOJ..13S..79.) already exists.\n',)