HasIO: attached io must not be mandatory
as an uri might be given instead.
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@ -47,7 +47,7 @@ class SilentError(CommunicationFailedError):
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class HasIO(Module):
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"""Mixin for modules using a communicator"""
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io = Attached()
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io = Attached(mandatory=False)
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uri = Property('uri for automatic creation of the attached communication module',
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StringType(), default='')
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