Piping to Standard Unix Commands Broken

[AlexandreCassagne]

The command,
$ echo '{"hello": "world"}' | underscore print | echo
outputs

      throw er; // Unhandled 'error' event
      ^

Error: write EPIPE
    at WriteWrap.afterWrite [as oncomplete] (net.js:788:14)
Emitted 'error' event at:
    at onwriteError (_stream_writable.js:431:12)
    at onwrite (_stream_writable.js:456:5)
    at _destroy (internal/streams/destroy.js:40:7)
    at Socket.dummyDestroy [as _destroy] (internal/process/stdio.js:11:34)
    at Socket.destroy (internal/streams/destroy.js:32:8)
    at WriteWrap.afterWrite [as oncomplete] (net.js:790:10)```