Update pelicanconf.py

Author: Dreamsorcerer

pelicanconf.py

@@ -69,7 +69,7 @@ def sponsors(preprocessor: Preprocessor, tag: str, markup: str) -> str:
 CATEGORY_URL = None
 CATEGORY_SAVE_AS = None
 CATEGORIES_SAVE_AS = None
-DEFAULT_CATEGORY = None
+DEFAULT_CATEGORY = ""
 # Index is the news listing. We move it in order to have our index.md file as the home page.
 INDEX_SAVE_AS = "news/index.html"
 # Pages we use prefix in order to split the menu between projects and general links.