Refactor HTML formatting to use mark_safe for safe rendering in various tables and models

longs/tables.py

@@ -6,6 +6,7 @@ from generic.tables import BlockImageColumn, SeriesImageColumn
 from .models import Long, LongSeries, UserAnswer
 
 from django.utils.html import format_html
+from django.utils.safestring import mark_safe
 from django.db.models import Prefetch
 
 from easy_thumbnails.files import get_thumbnailer
@@ -61,7 +62,7 @@ class PopupLinkColumn(tables.Column):
         obj = value.first()
 
         if obj is None:
-            return format_html("<span>No image<span>")
+            return mark_safe("<span>No image</span>")
 
         return obj.get_thumbnail()[0]