General bugfixes in Update 6.64.3

PI-8129

B

After updating to PSI 6.64, the "Postbox export" checkbox in the person link properties is always selected when Uniquare data is imported. This sometimes causes errors when uploading to Postbox.

Implemented solution:

1. When new person data is imported and no information is available in the "Postbox export" field, the default value "Y" is used.

2. If the person link already exists and the imported data does not contain any information about the "Postbox Export" field, the old value from the database is retained.

3. If the person link already exists and the imported data contains information about the "Postbox export" field, the new value is adopted and stored in the database.