fix(cloud): accept null model abilities (#2377)

Co-authored-by: dadachann <185672915+dadachann@users.noreply.github.com>

src/langbot/pkg/cloud/model_catalog.py

@@ -32,6 +32,11 @@ class CloudModelCatalogItem(BaseModel):
     is_featured: bool = False
     featured_order: int = 0
 
+    @field_validator('llm_abilities', mode='before')
+    @classmethod
+    def normalize_missing_abilities(cls, value: Any) -> Any:
+        return () if value is None else value
+
     @field_validator('llm_abilities')
     @classmethod
     def validate_abilities(cls, value: tuple[str, ...]) -> tuple[str, ...]:

tests/unit_tests/cloud/test_model_catalog.py

@@ -84,6 +84,15 @@ def _snapshot(
     )
 
 
+async def test_catalog_snapshot_treats_null_model_abilities_as_empty() -> None:
+    payload = _snapshot().model_dump(mode='json')
+    payload['models'][0]['llm_abilities'] = None
+
+    snapshot = CloudModelCatalogSnapshot.model_validate(payload)
+
+    assert snapshot.models[0].llm_abilities == ()
+
+
 async def test_catalog_reconciles_every_workspace_idempotently_and_tracks_owner_and_downlisting(tmp_path) -> None:
     engine = create_async_engine(f'sqlite+aiosqlite:///{tmp_path / "model-catalog.db"}')
     manager = PersistenceManager(object(), mode=PersistenceMode.CLOUD_RUNTIME)