fix: normalize nullable pull request authors (#56)

tests/test_context_timeout.py

@@ -90,4 +90,33 @@ async def test_context_normalizes_nullable_repository_description(monkeypatch):
     response = await main.context()
     repository = json.loads(response.body)["repos"][0]
 
-    assert repository["description"] == ""
+    assert repository["description"] == ""
+
+
+@pytest.mark.anyio
+async def test_context_normalizes_nullable_pull_request_author(monkeypatch):
+    async def user():
+        return {"id": 1, "login": "timmy"}
+
+    async def empty_collection():
+        return []
+
+    async def pull_request_collection():
+        return [{
+            "id": 56,
+            "number": 56,
+            "title": "Nullable author",
+            "state": "open",
+            "user": None,
+            "html_url": "https://forge.example/pulls/56",
+        }]
+
+    monkeypatch.setattr(main, "current_user", user)
+    monkeypatch.setattr(main, "repos", empty_collection)
+    monkeypatch.setattr(main, "issues", empty_collection)
+    monkeypatch.setattr(main, "pull_requests", pull_request_collection)
+
+    response = await main.context()
+    pull_request = json.loads(response.body)["pull_requests"][0]
+
+    assert pull_request["user"] == ""