Remove message box shown for invalid dates. It's better, if the user code does the error handling.
Remove message box shown for invalid dates. It's better, if the user code
does the error handling.

svn path=/trunk/kdepim/; revision=177860

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