fixed new user model input and renaming model group

src/app/models/user.model.ts

@@ -25,6 +25,8 @@ export class UserModel extends BaseModel{
     if (mode === 'admin') {
       keys.push('level');
       keys.push('models');
+      this.devices = this.devices.filter(e => e);
+      this.models = this.models.filter(e => e);
     }
     return pick(this, keys);
   }