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Fix task timing race in setnsec3param()

Ondřej Surý requested to merge 2636-timing-race-in-setnsec3param-task-ondrej/cleanup-double-createinctx-constructors-v9_16 into v9_16

When setnsec3param() is schedule from zone_postload() there's no guarantee that zone->db is not NULL yet. Thus when the setnsec3param() is called, we need to check for zone->db existence and reschedule the task, because calling rss_post() on a zone with empty .db ends up with no-op (the function just returns).

(cherry picked from commit 0127ba64)

Closes #2636 (closed)

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