Fixes #10 - Don't use defaults for json fields in migration

src/backend/models/access_list_auth.js

@@ -12,6 +12,11 @@ class AccessListAuth extends Model {
     $beforeInsert () {
         this.created_on  = Model.raw('NOW()');
         this.modified_on = Model.raw('NOW()');
+
+        // Default for meta
+        if (typeof this.meta === 'undefined') {
+            this.meta = {};
+        }
     }
 
     $beforeUpdate () {