Fix: include option api correction

AFAIK, hapi-sequelize doesn't have a `request.models`, but it does have
a `request.getDb()` method that has `models` on it. This calls that
method to get the related models, but allows `request.models` to keep
working for backward compatibility.

src/crud.js

@@ -31,6 +31,8 @@ export const list = (server, model) => {
       const include = parseInclude(request);
       const where = parseWhere(request);
 
+      if (include instanceof Error) return void reply(include);
+
       const list = await model.findAll({
         where, include,
       });