Partner Edit Screen: Fix for Partner DetailsTab for a Partner of Partner Class CHURCH:
* The Tab was missing Data Validation, specificially for a check whether Denominations are set up on the site at all.
* The base data was missing the 'UNKNOWN' Denomination code. This is now added and made non-deletable, but should it not be in place in a DB for some reason then the checks that were introduced in the Data Validation for the Details Tab of a CHURCH will pick that up and tell the user what to do in that special case.
merge from lp:openpetraorg