issue_comments: 828538649

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https://github.com/pydata/xarray/issues/5230#issuecomment-828538649 https://api.github.com/repos/pydata/xarray/issues/5230 828538649 MDEyOklzc3VlQ29tbWVudDgyODUzODY0OQ== 57914115 2021-04-28T15:13:51Z 2021-04-28T15:14:16Z CONTRIBUTOR

Thank you for the comment @TomNicholas, if it can help i think this error comes from this particular line : https://github.com/pydata/xarray/blob/master/xarray/core/combine.py#L81 from a missing else statement. Indeed, the concat_dims is empty due to initialization and then raise the error. 

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