Helpers.hasCoursePermission returns without calling callback on error

[taylortom]

See the following:

adapt_authoring/lib/helpers.js

Lines 150 to 153 in 7f1a23f

	if (err) {
	logger.log('error', err);
	return err;
	}

[lc-thomasberger]

will probaly be fixed in #2124