scripting: use new exception constructors

Change-Id: I7eeece85d4e462bf2df010ee29c062941a677759
Reviewed-on: https://gerrit.libreoffice.org/11966
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>