Merged in some changes missed in 12.6.1 as they weren't marked as ready to merge.

 - Legacy-Id: 10700

Author: levkowetz

ietf/doc/views_doc.py

@@ -675,7 +675,7 @@ def document_bibtex(request, name, rev=None):
     latest_revision = doc.latest_event(NewRevisionDocEvent, type="new_revision")
     replaced_by = [d.name for d in doc.related_that("replaces")]
     published = doc.latest_event(type="published_rfc")
-    rfc = latest_revision.doc if latest_revision.doc.get_state_slug() == "rfc" else None
+    rfc = latest_revision.doc if latest_revision and latest_revision.doc.get_state_slug() == "rfc" else None
 
     if rev != None and rev != doc.rev:
         # find the entry in the history

ietf/templates/doc/document_bibtex.bib

@@ -11,7 +11,7 @@
 @misc{% templatetag openbrace %}rfc{{ doc.rfc_number }},
 	series =	{Request for Comments},
 	number=		{{ doc.rfc_number }},
-	howpublished=	{% templatetag openbrace %}{{ doc.stream }} RFC {{ doc.rfc_number }} ({{ doc.intended_std_level }}){% templatetag closebrace %},
+	howpublished=	{% templatetag openbrace %}{{ doc.stream }} RFC {{ doc.rfc_number }}{% if doc.doc.intended_std_level %} ({{ doc.intended_std_level }}){% endif %}{% templatetag closebrace %},
 	publisher =	{RFC Editor},
 	doi =		{% templatetag openbrace %}10.17487/rfc{{ doc.rfc_number }}{% templatetag closebrace %},
 	url =		{https://rfc-editor.org/rfc/rfc{{ doc.rfc_number }}.txt},{% else %}