[fix bug 1039652] Don't display vouch message message if user.can_vouch is False.
[fix bug 1039652] Don't display vouch message message if user.can_vouch is False.

hoosteeno/mozillians,chirilo/mozillians,mozilla/mozillians,hoosteeno/mozillians,mozilla/mozillians,hoosteeno/mozillians,brian-yang/mozillians,brian-yang/mozillians,hoosteeno/mozillians,justinpotts/mozillians,akarki15/mozillians,akarki15/mozillians,chirilo/mozillians,anistark/mozillians,akatsoulas/mozillians,safwanrahman/mozillians,johngian/mozillians,mozilla/mozillians,akatsoulas/mozillians,ChristineLaMuse/mozillians,safwanrahman/mozillians,fxa90id/mozillians,brian-yang/mozillians,fxa90id/mozillians,chirilo/mozillians,anistark/mozillians,ChristineLaMuse/mozillians,justinpotts/mozillians,johngian/mozillians,akatsoulas/mozillians,johngian/mozillians,chirilo/mozillians,safwanrahman/mozillians,akarki15/mozillians,ChristineLaMuse/mozillians,johngian/mozillians,anistark/mozillians,justinpotts/mozillians,fxa90id/mozillians,akatsoulas/mozillians,akarki15/mozillians,safwanrahman/mozillians,justinpotts/mozillians,anistark/mozillians,mozilla/mozillians,fxa90id/mozillians,brian-yang/mozillians