[TYPO3-calendar] frontend editing cal_location / location

[Lars Möller]

hello,

i realized that a once selected cal_location from the list could not be 
deselected anymore in the frontediting.
even if the field location is set, the field cal_location is rendered out.

same behavior with the field organizer and cal_organizer.
and in the frontend editing a once attached file could not be removed 
anymore.

are there workarounds or setting?

best
lars