[FIX] Calendar : Prevent corruption of calendar modal when there is no calendar at creation of an event

When there is no calendar and you want to create an event by clicking on a date, the page is loaded in the modal. To prevent this, the user is taken to the error page when there is no event yet.

Ticket : https://avan.tech/item74770

Before :

24.02.2022_19.38.41_REC

After modification :

screencast-127.0.0.1-2022.03.04-13_58_56