Promise rejections are ignored by terminal echo

[jcubic]

Issue summary

Promise rejections are ignored by terminal echo

Expected behavior

It should print the error message and exception like normal errors

Actual behavior

Nothing is printed on terminal

Steps to reproduce

Execute:

function error() {
    return Promise.reject(new Error('Some Error'));
}

term.echo(error);
term.echo(error());

Browser and OS

NA

Additional notes

Demo: https://codepen.io/jcubic/pen/wvyRvjz?editors=0010