Bad error message when trying to format code with syntax errors

[lydell]

https://ellie-app.com/6B98MmwvZZBa1

1. Make a syntax error
2. Click format

Result:

Formatting failed
The server couldn't format your code. Formatting should always work, so the maintainers have been notified of this issue.

Expected result:
A message saying that the formatting could not be carried out due to a syntax error. Maybe autorun Compile so we get Elm's syntax errors?