When creating an event for only yourself and not any other participants there is no need to have two rows, one for you and one for all perticipants, when you look at the availability.
Steps to reproduce:
1. Create an event
2. Add no participants and safe.
3. Click on the event again and click on "find availability" in the "participants" tab.
There are two rows, one with your name and one with "required/all participants".
There is only one row with your name, no sum of participants when there's only one.