When a task has the candidate group, the assignee will be null . So there is error in APW
Steps to create:
1. Create a Step Editor in process and assign a candidate group.
2. Create a app with the above process model.
3. Deploy it APS
4. Now go to that app in APW, create a process
5. Go to Involved Task and click the task to open info-drawer
Actual : Info-drawer is not visible
Expected : Info-drawer should open
Note: There are console errors