discard from set to ignore KeyError
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@ -152,7 +152,7 @@ class History(Plugin):
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def _remove_channel_participant(self, where, who):
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def _remove_channel_participant(self, where, who):
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"""Remove the specified who from the where channel's participants list."""
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"""Remove the specified who from the where channel's participants list."""
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participants = self.channel_participants.setdefault(where, set())
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participants = self.channel_participants.setdefault(where, set())
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participants.remove(who)
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participants.discard(who)
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logger.debug("participants for %s: %s", where, participants)
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logger.debug("participants for %s: %s", where, participants)
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