Allow for empty handler parameter in call to zmq::poller_t::add(). #119
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…zmq::poller_t::add().
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handler parameter is std::function.
If default-constructed std::function is given to zmq::poller_t::add() as handler parameter it throws an exception in zmq::poller_t::wait() because empty std::function is invoked. This PR checks if handler is empty. If it is, forwards NULL to zmq_poller_add() and does not try to invoke handler on wait().