nginx-zabbix: Ignore request time of 0 for stats

All the cached requests have 0 request time and that brings the median
request time to 0 nearly all the time thus rendering the stats useless.
Since we want to know how the application requests perform, we can just
ignore 0 values.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/zabbix-agent/files/nginx-zabbix.pl

@@ -86,7 +86,7 @@ sub main {
 			my $stat = $stat_per_host->{$host};
 			my $values = $values_per_host->{$host};
 
-			$stat->add_data($+{request_time});
+			$stat->add_data($+{request_time}) if $+{request_time} != 0;
 			$values->{request_count}++;
 
 			my $status_key = defined $values->{status}->{$+{status}} ? $+{status} : "other";