Fail textDocument/formatting when no formatter is set #108
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Currently, nil silently fails when no formatter is set. This caused me a lot of confusion as to why nothing was formatting when I accidentally misconfigured the formatter.
This makes it so that we return an error instead, alerting the user that something is wrong.
This could be annoying to someone who hasn't configured a formatter on purpose but still causes formatting events, either by format-on-save or muscle memory. I think this is fine, and they should turn off format-on-save or just get a formatter instead. Alternatively, someone could set
cat
as their formatter.