code: def fail(self, cmd, title=None, message=None):
          
          if message is None:
              message = self.handle_exc()
          else:
              message = escape(message)
          self.db.send(
              'Echo|%s' % dump({
                  'for': escape(title or '%s failed' % cmd),
                  'val': message
              })
          )
docs: Send back captured exceptions