fix: allow hidden collaborator emails

tests/test_api_projects.py

@@ -415,3 +415,35 @@ async def test_get_collaborators(
         assert len(respx_mock.calls) == count + 1
         assert collaborators == default_collaborators_list[i]
         count += 1
+
+
+@pytest.mark.asyncio
+async def test_get_collaborators_accepts_hidden_email(
+    todoist_api: TodoistAPI,
+    todoist_api_async: TodoistAPIAsync,
+    respx_mock: respx.MockRouter,
+) -> None:
+    project_id = "6X7rM8997g3RQmvh"
+    endpoint = f"{DEFAULT_API_URL}/projects/{project_id}/collaborators"
+    response: PaginatedResults = {
+        "results": [{"id": "123", "name": "Alice D.", "email": None}],
+        "next_cursor": None,
+    }
+
+    mock_route(
+        respx_mock,
+        method="GET",
+        url=endpoint,
+        request_headers=api_headers(),
+        response_json=response,
+        response_status=200,
+    )
+
+    collaborators = next(todoist_api.get_collaborators(project_id))
+
+    assert collaborators == [Collaborator(id="123", name="Alice D.", email=None)]
+
+    collaborators_async_iter = await todoist_api_async.get_collaborators(project_id)
+
+    async for collaborators in collaborators_async_iter:
+        assert collaborators == [Collaborator(id="123", name="Alice D.", email=None)]

todoist_api_python/models.py

@@ -142,7 +142,7 @@ class _(JSONPyWizard.Meta):  # noqa:N801
         v1 = True
 
     id: str
-    email: str
+    email: str | None
     name: str