{"action":"closed","number":4778,"pull_request":{"url":"https://api.github.com/repos/GoogleCloudPlatform/google-cloud-python/pulls/4778","id":164709632,"html_url":"https://github.com/GoogleCloudPlatform/google-cloud-python/pull/4778","diff_url":"https://github.com/GoogleCloudPlatform/google-cloud-python/pull/4778.diff","patch_url":"https://github.com/GoogleCloudPlatform/google-cloud-python/pull/4778.patch","issue_url":"https://api.github.com/repos/GoogleCloudPlatform/google-cloud-python/issues/4778","number":4778,"state":"closed","locked":false,"title":"Datastore: Allow empty lists in protobuf array value","user":{"login":"chemelnucfin","id":3982092,"avatar_url":"https://avatars1.githubusercontent.com/u/3982092?v=4","gravatar_id":"","url":"https://api.github.com/users/chemelnucfin","html_url":"https://github.com/chemelnucfin","followers_url":"https://api.github.com/users/chemelnucfin/followers","following_url":"https://api.github.com/users/chemelnucfin/following{/other_user}","gists_url":"https://api.github.com/users/chemelnucfin/gists{/gist_id}","starred_url":"https://api.github.com/users/chemelnucfin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chemelnucfin/subscriptions","organizations_url":"https://api.github.com/users/chemelnucfin/orgs","repos_url":"https://api.github.com/users/chemelnucfin/repos","events_url":"https://api.github.com/users/chemelnucfin/events{/privacy}","received_events_url":"https://api.github.com/users/chemelnucfin/received_events","type":"User","site_admin":false},"body":"Fixes #3152.\r\n\r\n@lukesneeringer This was your fix, so I believe you should be able to get me an LGTM soon right?  :)\r\n\r\n@dhermes I would like to ask that you are ok with it since I mostly referred to your test_system code.\r\n\r\n@tseaver Do you mind looking it over just so I didn't miss anything?\r\n\r\nI consolidated all of our responses and comments and made this pull request.\r\n\r\nI backed out the code change and the errors happen. \r\n\r\nSeparately, I have also investigated that\r\n``` \r\narray_values{\r\n  values{\r\n  }\r\n}\r\n```\r\nwould `raise ValueError` when put into an entity.  It might be desired behavior, but we might need to deal with it at some point.  The issue is that `len(array_value.values)` is 1 and the result for this was not `[]` as I had expected in the following code:\r\n```\r\n        result = [_get_value_from_value_pb(value)\r\n                  for value in value_pb.array_value.values]\r\n```\r\n\r\nAnyway, shall we get this merged soon 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