Fix oddities using a file in the root - fixes #471
Fix oddities using a file in the root - fixes #471

  * Check return from NewFsObject which caused nil ptr deref
  * Correct root directory from "" to string(os.PathSeparator) in getDirFile

yonjah/rclone,seuffert/rclone,yonjah/rclone,B4dM4n/rclone,olihey/rclone,yonjah/rclone,arcimboldo/rclone,B4dM4n/rclone,B4dM4n/rclone,yonjah/rclone,jackschmidt/rclone,kynikos/rclone,B4dM4n/rclone,jackschmidt/rclone,kynikos/rclone,arcimboldo/rclone,seuffert/rclone,ncw/rclone,olihey/rclone,ncw/rclone,jackschmidt/rclone,kynikos/rclone,jackschmidt/rclone,olihey/rclone,ncw/rclone,ncw/rclone,olihey/rclone,arcimboldo/rclone,seuffert/rclone,arcimboldo/rclone,kynikos/rclone,seuffert/rclone