refreshing an empty playing schedule results in additional gamedays

[MarcelSchmidberger]

Summary

When you refresh the playing schedule site of an league with exactly one user, for each refresh a new empty playing day is created.

Steps to reproduce

create an league where only one participant is joined (only tested for single users but Teams should be the same). Now visit the playing schedule page. When reloading the site new gamedays appear.

Expected results

The playing schedule of an event with one player should be empty with no game days, just like an event with zero joined participants. It should look like this:

Actual results

Initially the playing schedule contains one game day and every time you reload the site a new game day is created. (see image)