[zmq] make publish address optional
It should be possible to use the zmq communication bus in a read-only
manner. Allow setting zmq-address-sub without zmq-address-pub.
Closes #2897178.
$(document).ready(function() {
module("air");
test("test 1", function() {
equals(2, 4);
});
test("test 2", function() {
equals('', '45');
equals('1024', '32');
});
module("able");
test("test 3", function() {
same(1, 1);
});
});