report update questions - MVZ Bird Narrow box label

[dustymc]

https://arctos.database.museum/Reports/reporter.cfm?action=edit&report_id=180

@mkoo this report pulls "collectornumber" as a cascade of 'if exist then else ...', and then separately "collector_number_issued_by" and "preparator_number_issued_by", with the comment

In the cases where a PLC identifier exists, the preparator number should be listed in the collector slot

Please confirm that these are somehow separate and can't be merged with one function

If I understand the situation, I will experiment with 2 functions

1. get the most-relevant identifier, and
2. get the 'preparator'