mod_report_forward: Fix traceback on error message passed to datetime function If archive:get() returns an error, e.g. because it can't find a message with the given ID, it may return e.g. nil, "item-not-found" or similar where the error condition ends up in reported_message_time, which gets passed to util.datetime, which thus ends up doing math to a string or error object.

$(function() {
	let jsxc = new JSXC({
		loadConnectionOptions: function(username, password) {
			return Promise.resolve(%s);
		}
	});

	let formElement = $('#jsxc_login_form');
	let usernameElement = $('#jsxc_username');
	let passwordElement = $('#jsxc_password');

	jsxc.watchForm(formElement, usernameElement, passwordElement);
});