Switch to side-by-side view

--- a/ForgeTracker/forgetracker/model/ticket.py
+++ b/ForgeTracker/forgetracker/model/ticket.py
@@ -230,7 +230,7 @@
         milestone = None
         for fld in self.globals.milestone_fields:
             if fld.name == '_milestone':
-                return self.custom_fields['_milestone']
+                return self.custom_fields.get('_milestone', '')
         return milestone
 
     @property