Blog index crash when no category

[lenybernard]

Description

When there isn't any blog category in database, blog's index crash

Resolution Ideas

avoid to crash by just allowing an empty collection around the blog_rss_category route generation

Related to

Bundle	--	--	--
Analytics		Page
Blog	✔	Query
BusinessEntity		Seo
BusinessPage		Sitemap
Core		Template
Criteria		Twig
Filter		User
Form		ViewReference
I18n		Widget
Media		WidgetMap
UI