Fix disco_nu_ups when there's no upsd daemon running
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@ -3,6 +3,8 @@ package Zabbix::Agent::Addons::UPS;
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use warnings;
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use strict;
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use File::Which;
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use File::Spec;
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open STDERR, '>', File::Spec->devnull() or die "could not open STDERR: $!\n";
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# List configured UPS (only nut is supported)
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sub list_ups {
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