Duplicate persons: update form showing up condition
Duplicate persons: update form showing up condition

The forms for marking people as reviewed will be always shown, whereas
forms for merging persons will be only shown, if the number of records
in the table is at least 2.

swcarpentry/amy,swcarpentry/amy,swcarpentry/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy