so we get nice logs of the exception dynamic type for UNO exceptions.

Change-Id: Ic0b10dc14d354a2c9a0591b3a51d2f1640d54bdb
Reviewed-on: https://gerrit.libreoffice.org/52465Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>