[PR #8614/9dd2b71d backport][stable-9] nsupdate: fix 'index out of range' error when changing NS records #8630
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This is a backport of PR #8614 as merged into main (9dd2b71).
SUMMARY
fallback to authority section of the response if there is no authoritative answer, instead of crashing
fixes #8612
ISSUE TYPE
COMPONENT NAME
nsupdate
ADDITIONAL INFORMATION