Merge pull request rapid7#21413 from tart0ru5/patch-1

Improve failure condition checks

Author: adfoster-r7

modules/exploits/linux/http/projectsend_unauth_rce.rb

@@ -217,7 +217,7 @@ def register_new_user(username, password)
       'vars_post' => params
     })
 
-    fail_with(Failure::Unknown, 'Could not create a new user') unless res&.code != 403
+    fail_with(Failure::Unknown, 'Could not create a new user') if res.nil? || res.code == 403
     print_good("User #{username} created with password #{password}")
   end