Fix nullable fields in Supervisor info model (#287)

* Add test for supervisor info with version_latest None

Covers the case where version info failed to fetch and the Supervisor
API returns null for version_latest.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Add test for supervisor info optional fields being None

Covers version_latest (version fetch failed) and arch (io.hass.arch
label missing) both returning null from the Supervisor API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Drop expected

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: agners

aiohasupervisor/models/supervisor.py

@@ -26,10 +26,10 @@ class SupervisorInfo(ResponseData):
     """SupervisorInfo model."""
 
     version: str
-    version_latest: str
+    version_latest: str | None
     update_available: bool
     channel: UpdateChannel
-    arch: str
+    arch: str | None
     supported: bool
     healthy: bool
     ip_address: IPv4Address

tests/test_supervisor.py

@@ -47,6 +47,26 @@ async def test_supervisor_info(
     assert info.detect_blocking_io is False
 
 
+@pytest.mark.parametrize("field", ["version_latest", "arch"])
+async def test_supervisor_info_optional_fields_none(
+    responses: aioresponses,
+    supervisor_client: SupervisorClient,
+    field: str,
+) -> None:
+    """Test supervisor info API when optional fields are None."""
+    import json
+
+    fixture = json.loads(load_fixture("supervisor_info.json"))
+    fixture["data"][field] = None
+    responses.get(
+        f"{SUPERVISOR_URL}/supervisor/info",
+        status=200,
+        payload=fixture,
+    )
+    info = await supervisor_client.supervisor.info()
+    assert getattr(info, field) is None
+
+
 async def test_supervisor_stats(
     responses: aioresponses, supervisor_client: SupervisorClient
 ) -> None: