Users without edit right on the main calendar space cannot create events from the main calendar page

If a user has only edit rights on some calendars, but not on the main calendar space, this user cannot create events from the main calendar page.

Steps to reproduce:

1. remove edit rights to the "MoccaCalendar" space to the XWikiAllGroup
2. grant edit rights e.g. to the "MoccaCalendar.OtherEvents" subcalendar to the "XWikiAllGroup"
3. log in with a user without admin rights and go to the "MoccaCalendar" space

Expected behavior:

• user sees the "create Event" button, and can create events (though only in the "Other Events" calendar)

Actual behavior:

• user sees not "Create Events" button in the main calendar, but has to navigate to "Other Events" to create events from there.