Use tuple return values in users and groups model

dashboard/src/models/UsersModel.js

@@ -6,7 +6,6 @@ function create() {
   const origin = import.meta.env.VITE_API_ORIGIN || window.location.origin;
 
   return {
-    name: 'UsersModel',
     async list() {
       const perPage = 5000;
 
@@ -21,11 +20,7 @@ function create() {
           error = e;
         }
 
-        if (error || result.status !== 200) {
-          console.error('Failed to list users.', error || result.status);
-          users = [];
-          break;
-        }
+        if (error || result.status !== 200) return [error || result];
 
         users = users.concat(result.body.users);
 
@@ -34,7 +29,7 @@ function create() {
         page++;
       }
 
-      return users;
+      return [null, users];
     },
   };
 }