Improve message when exception class is not found
Improve message when exception class is not found

If we try to throw an exception that does not exist, we must report that
the exception class has not been found, not that we "cannot throw any
exceptions".

Change-Id: I850a64d635cc21cc43047f478801242220d5cd26
Reviewed-on: http://gerrit.aldebaran.lan/70365
Reviewed-by: rvimont <20c35f6f0668496f51846e8638771ff6c82c8c27@presta.aldebaran.com>
Tested-by: gerrit
Reviewed-by: epinault <1abfa0def69a0dac55855768c5bb3267b3ee08b8@aldebaran-robotics.com>

aldebaran/libqi-java,aldebaran/libqi-java,aldebaran/libqi-java