A catalog zone with an unset ``default-primaries`` clause could cause
an unexpected termination of the :iscman:`named` process after two
reloading or reconfiguration commands. This has been fixed.
Closes #5494
Merge branch '5494-catz-crash-with-unset-default-primaries-and-double-reconfig' into 'main'
See merge request isc-projects/bind9!10896