holding_bridge: ensure moh participants get frames

Currently, if a blank musiconhold.conf is used, musiconhold will fail
to start for a channel going into a holding bridge with an anticipation
of getting music on hold. That being the case, no frames will be written
to the channel and that can pose a problem for blind transfers in PJSIP
which may rely on frames being written to get past the REFER framehook.
This patch makes holding bridges start a silence generator if starting
music on hold fails and makes it so that if no music on hold functions
are installed that the ast_moh_start function will report a failure so
that consumers of that function will be able to respond appropriately.

ASTERISK-25271 #close

Change-Id: I06f066728604943cba0bb0b39fa7cf658a21cd99
(cherry picked from commit 8458b8d441)

main/channel.c

@@ -7403,7 +7403,7 @@ int ast_moh_start(struct ast_channel *chan, const char *mclass, const char *inte
 
 	ast_verb(3, "Music class %s requested but no musiconhold loaded.\n", mclass ? mclass : (interpclass ? interpclass : "default"));
 
-	return 0;
+	return -1;
 }
 
 void ast_moh_stop(struct ast_channel *chan)