Introducing attachments fixes for blog posts and assets.

Requires migration of attachments schema using
python manage.py maintenance upgrade_attachment_schema --all

pillar/web/main/routes.py

@@ -148,7 +148,6 @@ def main_posts_create():
 @blueprint.route('/p/<project_url>/blog/<url>')
 def project_blog(project_url, url=None):
     """View project blog"""
-
     return posts_view(project_url=project_url, url=url)