1. Go to http://phorge.localhost/T1, select "Start Tracking Time", remove both values, click the "Start Timer" button
2. Go to http://phorge.localhost/phrequent/ and see that the task is listed
3. Go to http://phorge.localhost/T1, select "Stop Tracking Time", remove both values, click the "Stop Timer" button
4. Go to http://phorge.localhost/phrequent/ and see that the task is not listed
5. Use a non-standard task creation form via http://phorge.localhost/maniphest/task/edit/form/5/ which has custom date fields visible and editable defined via http://phorge.localhost/config/edit/maniphest.custom-field-definitions/, enable the date fields, and remove their values, and file the task. Same behavior as on git master without the patch: These custom date values get set on the newly created task (which is not what I'd expect but it's not a regression created by this patch).