Does not indicate when results returned from API are incompatible

[apd-mharras]

I am trying to use the API Connect plugin to read from an API that returns XML results. The plugin indicated that the connection was successful but no results returned. I would prefer if the plugin returned any kind of message to indicate that the API results cannot be read due to the incompatible format. This would save a lot of development time as I tried to troubleshoot why I wasn't getting my results.