"You can only make functions into Conduits."

When running the example using postal.when-0.2.0, postal-0.10.1, conduit-0.3.2, lodash-2.4.1-compat, in Chrome v36, I received the following error:

"You can only make functions into Conduits." from conduit.js

By adding an explicit, empty callback function to each of the channels, the issue appears to have gone away.

postal.when([
    { channel: "ChannelA", topic: "topic.on.channel.a", callback: function() {} },
    { channel: "ChannelB", topic: "topic.on.channel.b", callback: function() {} },
    { channel: "ChannelC", topic: "topic.on.channel.c", callback: function() {} },
    { channel: "ChannelD", topic: "topic.on.channel.d", callback: function() {} },
], function(a, b, c, d){
    _.each(arguments, function(x) {
        $('body').append("<div>" + x + "</div>");
    });
});

postal.publish( { channel: "ChannelD", topic: "topic.on.channel.d", data: "And it's testable!" } );
postal.publish( { channel: "ChannelB", topic: "topic.on.channel.b", data: "Deferred behavior!" } );
postal.publish( { channel: "ChannelA", topic: "topic.on.channel.a", data: "Hey look!" } );
postal.publish( { channel: "ChannelC", topic: "topic.on.channel.c", data: "Via message bus!" } ); 

Hopefully this help. Thanks for your hard work on postal.when. It's very helpful.

[ifandelse]

@jjcode ah - thanks for the heads-up on this. I'll look at adding default no-op callbacks under the hood if one isn't provided.

[cordovapolymer]

@ifandelse @jjcode bump!