Javascript error if options set to false

Hi there,
Thanks for making this plugin, it helped to quickly setup and test our xmpp server on our webpages.
Just a small bug I found while testing
In conversejs.php you’ve the following lines:

$call = (get_option('call')) ?: false;
	$carbons = (get_option('carbons')) ?: false;
	$foward = (get_option('foward')) ?: false;

which should be:

$call = (get_option('call')) ?: 'false';
	$carbons = (get_option('carbons')) ?: 'false';
	$foward = (get_option('foward')) ?: 'false';

as false casted to string yields an empty string, thus the javascript generated below contains errors.

Cheers,
Guillermo

https://wordpress.org/plugins/conversejs/