issue_comments: 506383042

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https://github.com/pydata/xarray/pull/2706#issuecomment-506383042 https://api.github.com/repos/pydata/xarray/issues/2706 506383042 MDEyOklzc3VlQ29tbWVudDUwNjM4MzA0Mg== 1197350 2019-06-27T14:59:52Z 2019-06-27T14:59:52Z MEMBER

adding a new variable currently errors if we don't provide the append_dim argument:

Is this scenario now covered by the tests? Sorry if the answer is obvious; it's hard for me to discern just by looking at the code.

 
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