Catch an additional exception which can occur during generation of all_id2.txt

 - Legacy-Id: 2239

Author: levkowetz

ietf/idindex/views.py

@@ -78,7 +78,7 @@ def all_id2_entry(id):
     # 5
     try:
         fields.append(id.replaced_by.filename)
-    except InternetDraft.DoesNotExist:
+    except (AttributeError, InternetDraft.DoesNotExist):
         fields.append("")
     # 6
     fields.append(id.revision_date)