docs: def send(self, *sender, **kwargs):
          """Emit this signal on behalf of `sender`, passing on kwargs.
  
          This is an extension of `Signal.send` that changes one thing:
          Exceptions raised in calling the receiver are logged but do not fail
          """
          if len(sender) == 0:
              sender = None
          elif len(sender) > 1:
              raise TypeError('send() accepts only one positional argument, '
                              '%s given' % len(sender))
          else:
              sender = sender[0]
  
          if not self.receivers:
              return []
  
          rv = list()
          for receiver in self.receivers_for(sender):
              try:
                  rv.append((receiver, receiver(sender, **kwargs)))
              except Exception:
                  logger.exception('Error while dispatching signal "{}" '
                                   'to receiver'.format(self.name))
          return rv