Provide error message for QUEUE_MEMBER when member is not in queue

When QUEUE_MEMBER is used and the member specified is not in the queue,
Asterisk provides an ERROR message that indicates that the option specified
is not valid. This patch now properly displays an ERROR message that the
member is not in the queue if an interface is specified.

(closes issue ASTERISK-21980)
Reported by: Avraam David
........

Merged revisions 394345 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394346 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -7362,6 +7362,9 @@ static int queue_function_mem_read(struct ast_channel *chan, const char *cmd, ch
 			   ((m = interface_exists(q, args.interface)))) {
 			count = m->ringinuse;
 			ao2_ref(m, -1);
+		} else if (!ast_strlen_zero(args.interface)) {
+			ast_log(LOG_ERROR, "Queue member interface %s not in queue %s\n",
+				args.interface, args.queuename);
 		} else {
 			ast_log(LOG_ERROR, "Unknown option %s provided to %s, valid values are: "
 				"logged, free, ready, count, penalty, paused, ringinuse\n", args.option, cmd);