raise unexpected exception while property value is [] #403
Description
the following sample code
entity = Entity(dataset, 'test')
entity['a'] = []
entity.save()will raise exception
File "/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/entity.py", line 244, in save
exclude_from_indexes=self.exclude_from_indexes())
File "/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py", line 429, in save_entity
result = self.commit(dataset_id, mutation)
File "/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py", line 329, in commit
datastore_pb.CommitResponse)
File "/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py", line 81, in _rpc
data=request_pb.SerializeToString())
File "/usr/local/lib/python2.7/dist-packages/google/protobuf/internal/python_message.py", line 813, in SerializeToString
self.DESCRIPTOR.full_name, ','.join(self.FindInitializationErrors())))
EncodeError: Message api.services.datastore.CommitRequest is missing required fields: mutation.upsert[0].property[0].value
It (protobuf) makes no distinction between an empty list and a null list.
http://stackoverflow.com/questions/2378666/protobuf-net-serializing-an-empty-list
it looks like a property with empty list should be skip entirely