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Implements signals based on blinker if available, otherwise
falls silently back to a noop. Shamelessly stolen from flask.signals:
https://github.com/mitsuhiko/flask/blob/master/flask/signals.py
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r a If blinker is unavailable, create a fake class with the same
interface that allows sending of signals but will fail with an
error on anything else. Instead of doing anything on send, it
will just ignore the arguments and do nothing instead.
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