[FIX] models: simplify partial setup of fields, let it crash silently

The setup of relational fields may be problematic, as they may refer to unknown
models via custom relational fields.  In a partial setup, do not try to skip
the field setup, but let it go and silently catch any exception if it crashes.
[IMP]added subtype in blog to send notification of blog follower and add follower in post when they comment on post.

Update website_blog.blog_post.js

Update test_ui.py