add SIGPIPE handler to RT config

This prevents the RT FCGI-Service from termination, because of the
missing signal handler. Nginx emits the signal on prematurely closed
connections. This happens more frequently than one would assume.

request-tracker/templates/RT_SiteConfig.pm.j2

@@ -97,3 +97,10 @@ Set($NotifyActor, 1);
 Set($LogoAltText, '{{rt_logotext}}');
 Set($LogoLinkURL, '{{rt_logolinkurl}}');
 #Set($LogoURL, it’s easier to upload this in the web interface);
+
+# should prevent crashing caused by nginx
+# from: https://rt-wiki.bestpractical.com/wiki/FreeBSDInstallGuide
+$SIG{'PIPE'} = sub { 
+	print STDERR "SIGPIPE @_\n";
+};
+