bug: Error when prefetching relationship with the Sync Client when relationship is `None`

[BeArchiTek]

Component

Python SDK

Infrahub SDK version

1.13.3

Current Behavior

=================================== FAILURES ===================================
______________________ TestDemoflow.test_proposed_change _______________________

self = <integration.test_workflow.TestDemoflow object at 0x7549f6af21b0>
client_main = <infrahub_sdk.client.InfrahubClientSync object at 0x7549f6b5aab0>
default_branch = 'test-demo'

    def test_proposed_change(self, client_main, default_branch):
        pc_mutation_create = Mutation(
            mutation="CoreProposedChangeCreate",
            input_data={
                "data": {
                    "name": {"value": "Test Merge PC"},
                    "source_branch": {"value": default_branch},
                    "destination_branch": {"value": "main"},
                }
            },
            query={"ok": None, "object": {"id": None}},
        )
        response_pc = client_main.execute_graphql(query=pc_mutation_create.render())
    
        pc_id = response_pc["CoreProposedChangeCreate"]["object"]["id"]
    
        max_attempts = 15
        attempts = 0
        validation_results = []
        validations_completed = False
    
        while not validations_completed and attempts < max_attempts:
>           pc = client_main.get(
                "CoreProposedChange",
                name__value="Test Merge PC",
                include=["validations"],
                exclude=["reviewers", "approved_by", "created_by"],
                prefetch_relationships=True,
                populate_store=True,
            )

tests/integration/test_workflow.py:181: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/client.py:2191: in get
    results = self.filters(
/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/client.py:2028: in filters
    nodes, related_nodes = process_batch() if parallel else process_non_batch()
/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/client.py:2015: in process_non_batch
    response, process_result = process_page(page_offset, page_number)
/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/client.py:1978: in process_page
    process_result: ProcessRelationsNodeSync = self._process_nodes_and_relationships(
/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/client.py:1860: in _process_nodes_and_relationships
    node._process_relationships(node_data=item, branch=branch, related_nodes=related_nodes, timeout=timeout)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = Test Merge PC
node_data = {'node': {'__typename': 'CoreProposedChange', 'description': {'value': None}, 'destination_branch': {'value': 'main'}, 'display_label': 'Test Merge PC', ...}}
branch = 'main', related_nodes = [], timeout = None

    def _process_relationships(
        self,
        node_data: dict[str, Any],
        branch: str,
        related_nodes: list[InfrahubNodeSync],
        timeout: int | None = None,
    ) -> None:
        """Processes the Relationships of a InfrahubNodeSync and add Related Nodes to a list.
    
        Args:
            node_data (dict[str, Any]): The item from the GraphQL response corresponding to the node.
            branch (str): The branch name.
            related_nodes (list[InfrahubNodeSync]): The list to which related nodes will be appended.
            timeout (int, optional): Overrides default timeout used when querying the graphql API. Specified in seconds.
    
        """
        for rel_name in self._relationships:
            rel = getattr(self, rel_name)
            if rel and isinstance(rel, RelatedNodeSync):
                relation = node_data["node"].get(rel_name)
>               if relation.get("node", None):
E               AttributeError: 'NoneType' object has no attribute 'get'

/root/.cache/pypoetry/virtualenvs/infrahub-demo-dc-fabric-7VLWAmpj-py3.12/lib/python3.12/site-packages/infrahub_sdk/node/node.py:1[49](https://github.com/opsmill/infrahub-demo-dc-fabric/actions/runs/15980729178/job/45074278286#step:7:50)7: AttributeErro

Expected Behavior

Better handling during the processing

Steps to Reproduce

See tests in demo-dc-fabric

Additional Information

No response