[bug] Added in check for MySQL OperationalError for local development

[MICROBA-951]

When running the notify_credentials command locally there is an
OperationalError thrown by MySQL when there are no more results
available for the queryset iterator. This change catches that exception,
checks state, and then logs according to that state. This code runs in
production without issue. This changes allows for the code to be run
locally without a separate code path.