rndc delzone crashes named if removed zone was defined in a catalog

Summary

rndc delzone zonefrom.catalog.example crashes named

BIND version used

• Affects v9.19: v9_19_8
• Affects v9.18: v9_18_10
• Affects v9.16: v9_16_36

Steps to reproduce

1. Configure secondary server with a catalog zone
2. Attempt to rndc delzone member zone from the catalog
3. Enjoy fireworks

What is the current bug behavior?

rndc reports:

zone 'z100000.test.' will be deleted.The following files were in use and may now be removed:
__catz___default_catalog.invalid_z100000.test.db

named exits:

server.c:13795: REQUIRE(config != ((void *)0)) failed, back trace

Unfortunately the machine does not have debugging tools installed, but I think this should suffice - it's 100 % reproducible.

Relevant configuration files

Same config as in #3744 (closed).