Fixes a gen-config issue related to non-runnables.

src/gen-config.cr

@@ -20,12 +20,14 @@ class Service
 			entry["domain"] = domain
 			entry["ports"] = ports
 
+			if !non_runnable
 				user = Passwd.new("/etc/passwd", "/etc/group")
 					.try &.get_user(user_name).not_nil!
 
 				entry["uid"] = user.uid
 				entry["gid"] = user.gid
 				entry["user"] = user.login
+			end
 
 			entry["consumers"] = Crinja.function do
 				token = arguments.varargs[0].to_s