allow to add Service without any models in Local mode

[yuki-mt]

Motivation

• In Local mode, cannot add model when no services are deployed
• currently, cannot add service when no models are uploaded

So only in local mode, allow to add Service without any models in Local mode

Goal

• able to add service in Local mode

Implementation

• in local mode, able to display page to add service with no model uploaded
• in local mode, not have to select model when adding service
• in local mode, raise error when uploading model with no service deployed
  • currently, add record to db and return 200 (not save model content anywhere)