Fix Error Message for Server-Wide Security Policy

[Toxalot]

This is very minor but I figured that if no one pointed it out, you may never know.

There's an error message that pops up when you try to save a Service Plan with settings that are contrary to the security policy. One of the items in the list is undefined. I'm pretty sure the undefined item refers to the safe_mode setting.

Just thought you might like to know. If there is a better way to send you this info, please let me know.