Restoring functionality from 1.2 wherein Retrydial will not exit if there is no announce file specified.

This change makes it so that if there is no announce file specified, the application will continue until finished (or caller hangs up).
If a bogus announce file is specified, then a warning message will be printed saying that the file could not be found, but execution will
still continue. 

(closes issue #10186, reported by jon, patched by me)



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@75253 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -1767,22 +1767,33 @@ static int retrydial_exec(struct ast_channel *chan, void *data)
 		res = dial_exec_full(chan, dialdata, &peerflags, &continue_exec);
 		if (continue_exec)
 			break;
+
 		if (res == 0) {
 			if (ast_test_flag(&peerflags, OPT_DTMF_EXIT)) {
-				if (!(res = ast_streamfile(chan, announce, chan->language)))
+				if (!ast_strlen_zero(announce)) {
-					res = ast_waitstream(chan, AST_DIGIT_ANY);
+					if (ast_fileexists(announce, NULL, chan->language)) {
+						if(!(res = ast_streamfile(chan, announce, chan->language)))								
+							ast_waitstream(chan, AST_DIGIT_ANY);
+					} else
+						ast_log(LOG_WARNING, "Announce file \"%s\" specified in Retrydial does not exist\n", announce);
+				}
 				if (!res && sleep) {
 					if (!ast_test_flag(chan, AST_FLAG_MOH))
 						ast_moh_start(chan, NULL, NULL);
 					res = ast_waitfordigit(chan, sleep);
 				}
 			} else {
-				if (!(res = ast_streamfile(chan, announce, chan->language)))
+				if (!ast_strlen_zero(announce)) {
-					res = ast_waitstream(chan, "");
+					if (ast_fileexists(announce, NULL, chan->language)) {
+						if (!(res = ast_streamfile(chan, announce, chan->language)))
+							res = ast_waitstream(chan, "");
+					} else
+						ast_log(LOG_WARNING, "Announce file \"%s\" specified in Retrydial does not exist\n", announce);
+				}
 				if (sleep) {
 					if (!ast_test_flag(chan, AST_FLAG_MOH))
 						ast_moh_start(chan, NULL, NULL);
-					if (!res) 
+					if (!res)
 						res = ast_waitfordigit(chan, sleep);
 				}
 			}