In authz controller, can not change repos admin without select a module path.

[jiangxin]

To reproduce the symptom:

• In authz controller, select a module path, and change ACL for it.
• After save authz, the module path selector reset.
• Then change the administrators for the repository.
• When save the form again, a javascript popup shows: "Please input module path.".

[jiangxin]

In pysvnmanager/templates/authz/index.mako:

       if (form.authz_list.length>0 && path =='')
       {
               alert('${_("Please input module path.")}');
               return false;
       }

[jiangx]

(In [80]) Fixed #22: In authz controller, can not change repos admin without select a module path.