Alert when Publication is missing

Is there a way to get a message when the code attempts to subscribe when no corresponding publish exists?

Pass an on error callback to Meteor.subscribe.

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To be specific, you need to pass an onStop callback:

Meteor.subscribe('non-existant', {
    onStop(reason) { console.error(reason) }, 
    onReady() { console.log('success') },
});
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