cope with missing email sender name string

screenless/bureau/mailroom/mailroom.py

@@ -304,10 +304,11 @@ class MailRoom(Bureau):
             msg.msgid = str(msgid)
             sender = envelope.from_[0]
             if sender.name is None:
-                sender.name = b""
+                msg.fromname = ""
+            else:
+                msg.fromname = clean_header(sender.name.decode("utf-8"))
             msg.fromaddr = sender.mailbox + b"@" + sender.host
             msg.fromaddr = clean_header(msg.fromaddr.decode("utf-8"))
-            msg.fromname = clean_header(sender.name.decode("utf-8"))
             msg.date = data[b"INTERNALDATE"].strftime("%d. %B %Y %I:%M%p")
             msg.subject = clean_header(envelope.subject.decode("utf-8"))