Improve HTTP error handling and error checking. Fixes #515.
Improve HTTP error handling and error checking. Fixes #515.

* Don't cast to string `None` values. Fixes `ip_address` checking logic for proper and actually set IP address.
* Handle non 200 HTTP error codes by properly stopping the execution.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt