Merged revisions 376726 via svnmerge from

file:///srv/subversion/repos/asterisk/branches/10

................
  r376726 | jrose | 2012-11-28 10:30:27 -0600 (Wed, 28 Nov 2012) | 16 lines
  
  manager: Make challenge work with allowmultiplelogin=no
  
  Prior to this patch, challenge would yield a multiple logins error if used
  without providing the username (which isn't really supposed to be an argument
  to challenge) if allowmultiplelogin was set to no because allowmultiplelogin
  finds a user with a zero length login name. This check is simply disabled for
  the challenge action when the username is empty by this patch.
  
  (closes issue ASTERISK-20677)
  Reported by: Vladimir
  Patches:
      challenge_action_nomultiplelogin.diff uploaded by Jonathan Rose (license 6182)
  ........
  
  Merged revisions 376725 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10-digiumphones@376754 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/manager.c

@@ -4844,7 +4844,7 @@ static int process_message(struct mansession *s, const struct message *m)
 			|| !strcasecmp(action, "Challenge"))) {
 		user = astman_get_header(m, "Username");
 
-		if (check_manager_session_inuse(user)) {
+		if (!ast_strlen_zero(user) && check_manager_session_inuse(user)) {
 			report_session_limit(s);
 			sleep(1);
 			mansession_lock(s);