Exception raised in get

[rlnsanz]

Exception is raised when attempting to get a node that is not in Ground. Correct behavior should be returning None.

In [3]: gc.get_node('albert')
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-3-ca0ec4e6f6f0> in <module>()
----> 1 gc.get_node('albert')

~/anaconda/envs/py36/lib/python3.6/site-packages/ground_client-0.1.2-py3.6.egg/ground/client.py in get_node(self, source_key)
    215 
    216     def get_node(self, source_key):
--> 217         return model.core.node.Node(self._get_item("nodes", source_key))
    218 
    219     def get_node_latest_versions(self, source_key):

~/anaconda/envs/py36/lib/python3.6/site-packages/ground_client-0.1.2-py3.6.egg/ground/common/model/core/node.py in __init__(self, json_payload)
      5 
      6     def __init__(self, json_payload):
----> 7         super().__init__(json_payload)
      8 
      9         self._name = json_payload.get('name', '')

~/anaconda/envs/py36/lib/python3.6/site-packages/ground_client-0.1.2-py3.6.egg/ground/common/model/version/item.py in __init__(self, json_payload)
      4 
      5     def __init__(self, json_payload):
----> 6         self._id   = json_payload.get('id') or 0
      7         self._tags = json_payload.get('tags') or {}
      8 

AttributeError: 'NoneType' object has no attribute 'get'