real fix for sinn3r bug

Author: brandonprry

modules/exploits/linux/http/lifesize_uvc_ping_rce.rb

@@ -71,6 +71,10 @@ def exploit
 
     token = /name='csrfmiddlewaretoken' value='(.*)'/.match(res.body)
 
+    if token.length < 2
+      fail_with("Could not find token on page.")
+    end
+
     token = token[1]
 
     post = {