set year to None if no posts

fet2020/posts/views.py

@@ -63,7 +63,9 @@ def index(request):
                     fet_meeting_only,
                 )
     else:
-        last_post_year = Post.objects.get_queryset().first().date.year
+        last_year = Post.objects.get_queryset().first()
+        if last_year:
+            last_post_year = last_year.date.year
             now_year = timezone.now().year
 
             # if the last post is a year old or more, then set year to it
@@ -71,6 +73,8 @@ def index(request):
                 year = last_post_year
             else:
                 year = now_year
+        else:
+            year = None
 
         data = {
             'year': year,