Exclude empty email addresses from the send list.

 - Legacy-Id: 7552

Author: levkowetz

ietf/utils/mail.py

@@ -71,7 +71,7 @@ def send_smtp(msg, bcc=None):
     addrlist = msg.get_all('To') + msg.get_all('Cc', [])
     if bcc:
         addrlist += [bcc]
-    to = [addr for name, addr in getaddresses(addrlist)]
+    to = [addr for name, addr in getaddresses(addrlist) if addr != '' ]
     if not to:
         log("No addressees for email from '%s', subject '%s'.  Nothing sent." % (frm, msg.get('Subject', '[no subject]')))
     else: