Fetch data/update state correctly.

[hakan-kemal]

In the calendar component on refresh the calendar data is not being fetched from the database and therefore; "calendar.map is not a function" is displayed as an error.

Returning to the main page and accessing the calendar from there works.

This issue could be due to the data being fetched in the parent component and therefore the state not being updated accordingly.

A solution could be to fetch the data in the correct component!