Switch to side-by-side view

--- a/ForgeTracker/forgetracker/tracker_main.py
+++ b/ForgeTracker/forgetracker/tracker_main.py
@@ -782,7 +782,7 @@
                 message += get_change_text(
                     get_label(k),
                     v,
-                    ticket.custom_fields[k])
+                    ticket.custom_fields.get(k) or '')
                 ticket.custom_fields[k] = v
             if message != '':
                 ticket.discussion_thread.post(message)