Check connections is not None
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@ -349,7 +349,7 @@ def serve(host, port, request_handler, error_handler, before_start=None,
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trigger_events(before_start, loop)
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trigger_events(before_start, loop)
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connections = connections or set()
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connections = connections if connections is not None else set()
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signal = Signal()
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signal = Signal()
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server = partial(
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server = partial(
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protocol,
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protocol,
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