Produces no output when executed via morbo

# Produces no output when executed via morbo
use Mojolicious::Lite;
use Mojo::IOLoop;
use Mojo::IOLoop::ReadWriteFork;

my $fork = Mojo::IOLoop::ReadWriteFork->new;
my $cat_result = '';

$fork->on(error => sub {
  my($fork, $error) = @_;
  warn $error;
});
$fork->on(close => sub {
  my($fork, $exit_value, $signal) = @_;
  warn "got close event";
  print $cat_result;
  #Mojo::IOLoop->stop;
});
$fork->on(read => sub {
  my($fork, $buffer) = @_; # $buffer = both STDERR and STDOUT
  $cat_result .= $buffer;
});

$fork->start(
  program => 'ls',
  program_args => [ '-l', '/tmp' ],
  conduit => 'pty',
);

#Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
app->start;