Allow loading of empty icalendar files.
Allow loading of empty icalendar files.

svn path=/trunk/kdepim/; revision=242906

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi