some improvements for calendar export
some improvements for calendar export

lrytz/core,andreas-p/nextcloud-server,sharidas/core,jbicha/server,xx621998xx/server,pixelipo/server,owncloud/core,cernbox/core,pixelipo/server,michaelletzgus/nextcloud-server,cernbox/core,phil-davis/core,endsguy/server,xx621998xx/server,nextcloud/server,michaelletzgus/nextcloud-server,sharidas/core,owncloud/core,sharidas/core,bluelml/core,whitekiba/server,pollopolea/core,bluelml/core,endsguy/server,pmattern/server,andreas-p/nextcloud-server,nextcloud/server,IljaN/core,bluelml/core,Ardinis/server,xx621998xx/server,jbicha/server,pollopolea/core,owncloud/core,IljaN/core,Ardinis/server,whitekiba/server,andreas-p/nextcloud-server,pixelipo/server,IljaN/core,endsguy/server,pollopolea/core,IljaN/core,bluelml/core,pixelipo/server,whitekiba/server,endsguy/server,whitekiba/server,lrytz/core,michaelletzgus/nextcloud-server,lrytz/core,cernbox/core,bluelml/core,sharidas/core,jbicha/server,andreas-p/nextcloud-server,Ardinis/server,pollopolea/core,andreas-p/nextcloud-server,pmattern/server,xx621998xx/server,lrytz/core,nextcloud/server,pmattern/server,pmattern/server,lrytz/core,IljaN/core,jbicha/server,pixelipo/server,sharidas/core,cernbox/core,endsguy/server,michaelletzgus/nextcloud-server,whitekiba/server,jbicha/server,Ardinis/server,xx621998xx/server,pollopolea/core,pmattern/server,owncloud/core,nextcloud/server,Ardinis/server,owncloud/core,cernbox/core