actorlib/sim/SimActor: do not drive busy low when generator yields None
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@ -60,7 +60,7 @@ class TokenExchanger(PureSimulable):
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self.active = set()
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else:
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raise TypeError
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if all(transaction.idle_wait for transaction in self.active):
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if self.active and all(transaction.idle_wait for transaction in self.active):
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self.busy = False
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def do_simulation(self, s):
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