JSONIPC: jsonipc.hh: avoid rethrowing exceptions
JSONIPC: jsonipc.hh: avoid rethrowing exceptions

GDB does not follow rethrown exceptions, so avoid it where possible.

Signed-off-by: Tim Janik <6ec6ff229c4e1c5bbd5933ee92e6c5832ff023bb@gnu.org>

swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast