Fix error when no blog search results can be found (#196)

The merger of #161 had accidentally caused the crucial
priviblur_extractor import to get removed, causing an error
on empty search results.

src/routes/blogs/blogs.py

@@ -2,6 +2,7 @@
 
 import sanic
 
+from ... import priviblur_extractor
 from ...cache import get_blog_posts, get_blog_search_results
 
 blogs = sanic.Blueprint("blogs", url_prefix="/")