reset to nil unmarshalled Resolved:null as zero time

Alexander Pavlovrequested to merge
fix/2543/watcher-update into develop

https://git.canopsis.net/canopsis/canopsis/-/issues/2543 Made partial (for two Get*Alarm methods only) replace of Resolved with nil pointer for alarms with {resolved:null}, that unmarshaled into Resolved:&types.CpsTime(0)

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