fix nil access

git-svn-id: file:///home/svn/framework3/trunk@11344 4d416f70-5f16-0410-b530-b9f4589650da

modules/exploits/windows/http/integard_password_bof.rb

@@ -85,7 +85,9 @@ class Metasploit3 < Msf::Exploit::Remote
 					'method' => 'GET'
 				}, 5)
 
-			case response['Content-Length'].to_i
+			clen = 0
+			clen ||= response['Content-Length'].to_i if response and response['Content-Length']
+			case clen
 			when 24584
 				print_status("[!] Found Version - Integard Home")
 				mytarget = targets[1]