Editing an event without series automatically assigns series, and does not allow to remove series from event using "No option"
Steps to reproduce
Steps to reproduce:
1. Have a series in our series list
2. Have an event with the series assigned
3. Change this to "No option", since we don't want to assign to a series
4. Save the event (ie. click "close")
5. Edit the event
The series is still assigned, "No option" does not have the desired effect of removing the series.
The event to have no series assigned.
Workaround (if any):