Fix nil bug in scan

Author: wvu

modules/exploits/multi/http/phpmyadmin_preg_replace.rb

@@ -145,7 +145,11 @@ def exploit
       fail_with(Failure::NotFound, "Failed to retrieve webpage.")
     end
 
-    token = login.headers['Location'].scan(/token=(.*)[&|$]/).flatten.first
+    if login.redirect?
+      token = login.redirection.to_s.scan(/token=(.*)[&|$]/).flatten.first
+    else
+      fail_with(Failure::NotFound, "Couldn't find token. Wrong PMA version?")
+    end
 
     cookies = login.get_cookies