[#1067] Handle Elvis config errors #1088
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Description
In case of an issue with the
elvis.config(e.g. when using an undefined rule), the Elvis backend crashes instead of reporting a regular diagnostic. This PR ensures that config errors are also displayed to the user as Diagnostics. We should probably add diagnostics for theelvis.configfile itself, but this should be an improvement. Since config errors do not correspond to a specific line in the open buffer, I'm arbitrarily reporting them on line 1.