Hornwitser 74a06e0b79 Change behaviour of on_error
Change how the old style on_error event is called to match the new style
on_error event.  Both are now called in case an exception is raised in
an user defined event handler, and will by default print the arguments
of the event tha raised the exception and the traceback for the
exception.  In addition, overridding the on_error handler supresses this
behaviour.
2015-10-06 19:09:16 +02:00
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