issues: 607718350

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
607718350 MDU6SXNzdWU2MDc3MTgzNTA= 4011 missing empty group when iterate over groupby_bins 9312831 open 0     4 2020-04-27T17:22:31Z 2022-04-09T03:08:14Z   NONE      

When I try to iterate over the object grouped returned by groupby_bins, I found that the empty group is missing silently. Here is a simple case: ```python array = xr.DataArray(np.arange(4), dims='dim_0')

one of these bins will be empty

bins = [0,4,5] grouped = array.groupby_bins('dim_0', bins)

for i, group in enumerate(grouped): print(str(i)+' '+group) ``` When a bin contains no samples (bin of (4, 5]), the empty group will be dropped. Then how to iterate over the full bins even when some bins contain nothing? I've read this related issue #1019. But my case here need the correct order in grouped and empty groups need to be iterated over.

 
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