bean: Use com.sun.star.uno.RuntimeException(Throwable thrwbl)

Change-Id: I6677072c349fc8c1997030b78fa38a5d78aec361
Reviewed-on: https://gerrit.libreoffice.org/11889
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>