code: def get_unique_node_by_name(manager, node_name, node_type):
      
      q = """
          MATCH (n:Node { name: {name} })
          WHERE {label} IN labels(n)
          RETURN n.handle_id as handle_id
          """
  
      with manager.session as s:
          result = list(s.run(q, {'name': node_name, 'label': node_type}))
  
      if result:
          if len(result) == 1:
              return get_node_model(manager, result[0]['handle_id'])
          raise exceptions.MultipleNodesReturned(node_name, node_type)
      return None
docs: Returns the node if the node is unique for name and type or None.
  
      :param manager: Neo4jDBSessionManager
      :param node_name: string
      :param node_type: str|unicode
      :return: norduniclient node model or None