mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

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	 * This shows the content of <noscript> if there's a problem
	 * loading converse.js for some reason
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} else {
	/*
	 * converse.js should have loaded, so we initialize it with
	 * the settings generated by Prosody. This uses sprintf-style
	 * formatting to insert the settigs as a JSON object.
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	converse.initialize(%s);
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