Diverse Code Cleanups

*Code wurde PEP-8 gerecht formatiert
* Kleine Fehler die der PyCharm Inspector beanstandet wurden korrigiert

aggregator/admin.py

@@ -1,7 +1,8 @@
 from django.contrib import admin
 from models import Feed, FeedItem
 
-admin.site.register(Feed,
+admin.site.register(
+    Feed,
     list_display=["title", "public_url", "last_update", 'is_functional'],
     list_filter=["is_functional"],
     ordering=["title"],
@@ -9,7 +10,8 @@ admin.site.register(Feed,
     list_per_page=500,
 )
 
-admin.site.register(FeedItem,
+admin.site.register(
+    FeedItem,
     list_display=['title', 'feed', 'date_modified'],
     list_filter=['feed'],
     search_fields=['feed__title', 'feed__public_url', 'title'],