Errors from the mapagent should be in the same format the originating request should be expecting

[jng]

When an error is thrown by the mapagent, a html page containing the error details is returned.

This makes no sense if the request is expecting a response in XML or JSON format. In such cases, the error should be formatted into the expected format that can be processed by the client making the original request.

If we make an XML request, we should expect an XML-formatted error message. If we make a JSON request, we should expect an JSON-formatted error message.

[jng]

Ticket retargeted after milestone closed

[jng]

Milestone renamed