fix: normalize nested activity metadata (#95)

tests/test_event_stream.py

@@ -162,3 +162,27 @@ async def test_activity_events_normalizes_null_feed_payload(monkeypatch):
     monkeypatch.setattr(gitea_proxy, "fetch", fake_fetch)
 
     assert await gitea_proxy.activity_events() == []
+
+
+@pytest.mark.anyio
+async def test_activity_events_normalizes_malformed_nested_metadata(monkeypatch):
+    async def fake_current_user():
+        return {"login": "timmy"}
+
+    async def fake_fetch(path):
+        return [{
+            "op_type": None,
+            "act_user": "unknown",
+            "repo": None,
+            "created": None,
+        }]
+
+    monkeypatch.setattr(gitea_proxy, "current_user", fake_current_user)
+    monkeypatch.setattr(gitea_proxy, "fetch", fake_fetch)
+
+    assert await gitea_proxy.activity_events() == [{
+        "type": "activity",
+        "actor": {},
+        "repo": {},
+        "created_at": "",
+    }]