issue_comments: 431477498

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https://github.com/pydata/xarray/pull/2492#issuecomment-431477498 https://api.github.com/repos/pydata/xarray/issues/2492 431477498 MDEyOklzc3VlQ29tbWVudDQzMTQ3NzQ5OA== 226037 2018-10-19T19:44:33Z 2018-10-19T19:45:48Z MEMBER

And we "refuse to guess"!

I broke the forrest of try / except to different functions with no real change (hopefully!) except _get_default_engine_grib.

Now opening a GRIB file without explicit engine raises an exception, but the error message suggests to the user to use the installed backend or to install one if none is present.

@shoyer if this too complex? Alternatively I can always return the same, generic, error message.

 
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