Fix undefined method error

[FixRM rapid7#8336]

Author: wchen-r7

modules/auxiliary/scanner/http/majordomo2_directory_traversal.rb

@@ -71,6 +71,11 @@ def run_host(ip)
 						'uri'     => uri + payload,
 					}, 25)
 
+				if res.nil?
+					print_error("Connection timed out")
+					return
+				end
+
 				print_status("#{rhost}:#{rport} Trying URL " + payload )
 
 				if (res and res.code == 200 and res.body)
@@ -93,6 +98,7 @@ def run_host(ip)
 						print_error("#{rhost}:#{rport} No HTML was returned")
 					end
 				else
+					# if res is nil, we hit this
 					print_error("#{rhost}:#{rport} Unrecognized #{res.code} response")
 				end
 				i += 1;