ClearCase: Fixed soft assert when currentState has no file

The first time updateStatusActions was executed the currentState
had no file, then currentState().relativeCurrentFile() would
give an soft assert.

Change-Id: I4566ace3e538c9834a4a47857f4234a527c37641
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>