Collect the statuses from the Assignments.
The hints returned are sorted by severity
function() {
        // TODO: work out when to clear this out for the plain Requisition case
        // this._hints = [];
        this.getAssignments(true).forEach(function(assignment) {
            this._hints.push(assignment.getHint());
        }, this);
        Hint.sort(this._hints);

        // We would like to put some initial help here, but for anyone but
        // a complete novice a 'type help' message is very annoying, so we
        // need to find a way to only display this message once, or for
        // until the user click a 'close' button or similar
        // TODO: Add special case for '' input
    }