--- a/mercurial/bundle2.py	Tue Mar 29 18:15:49 2022 +0900
+++ b/mercurial/bundle2.py	Thu Mar 24 12:27:21 2022 -0400
@@ -2528,7 +2528,8 @@
 @parthandler(b'stream2', (b'requirements', b'filecount', b'bytecount'))
 def handlestreamv2bundle(op, part):
 
-    requirements = urlreq.unquote(part.params[b'requirements']).split(b',')
+    requirements = urlreq.unquote(part.params[b'requirements'])
+    requirements = requirements.split(b',') if requirements else []
     filecount = int(part.params[b'filecount'])
     bytecount = int(part.params[b'bytecount'])