[FEATURE] Add own exception

Add an own file not exists exception to make it better catchable

Change-Id: Ifd2ee5b288ad85898b89ea800bc7cb342afc955d
Reviewed-on: http://review.typo3.org/32237
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Tested-by: Sebastian Fischer <typo3@evoweb.de>