[sr-dev] [kamailio/kamailio] schema: allow null value for active_watchers user-agent column (#1431)

[lazedo]

@miconda just noticed that you already backported https://github.com/kamailio/kamailio/commit/4654f8b4f341a6c9f8cf4daafc7d618871c95e1b . i would like to backport this PR if that's ok 

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