René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"raise unexpected exception while property value is []","articleBody":"the following sample code \n\n``` python\nentity = Entity(dataset, 'test')\nentity['a'] = []\nentity.save()\n```\n\nwill raise exception\n\n```\nFile \"/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/entity.py\", line 244, in save\n    exclude_from_indexes=self.exclude_from_indexes())\n  File \"/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py\", line 429, in save_entity\n    result = self.commit(dataset_id, mutation)\n  File \"/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py\", line 329, in commit\n    datastore_pb.CommitResponse)\n  File \"/usr/local/lib/python2.7/dist-packages/gcloud-0.3.0-py2.7.egg/gcloud/datastore/connection.py\", line 81, in _rpc\n    data=request_pb.SerializeToString())\n  File \"/usr/local/lib/python2.7/dist-packages/google/protobuf/internal/python_message.py\", line 813, in SerializeToString\n    self.DESCRIPTOR.full_name, ','.join(self.FindInitializationErrors())))\nEncodeError: Message api.services.datastore.CommitRequest is missing required fields: mutation.upsert[0].property[0].value\n```\n\n\u003e It (protobuf) makes no distinction between an empty list and a null list.\n\nhttp://stackoverflow.com/questions/2378666/protobuf-net-serializing-an-empty-list\nit looks like a property with empty list should be skip entirely\n","author":{"url":"https://github.com/lucemia","@type":"Person","name":"lucemia"},"datePublished":"2014-12-03T07:21:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/403/google-cloud-python/issues/403"}