Do not dial digits when none were specified for sig_pri based calls

(closes issue #15524)
Reported by: elguero
Patches:
      pri-sig-no-dest-set.patch uploaded by elguero (license 37)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@207950 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sig_pri.c

@@ -1789,10 +1789,11 @@ int sig_pri_call(struct sig_pri_chan *p, struct ast_channel *ast, char *rdest, i
 	p->outgoing = 1;
 
 	c = strchr(dest, '/');
-	if (c)
+	if (c) {
 		c++;
-	else
-		c = dest;
+	} else {
+		c = "";
+	}
 
 	l = NULL;
 	n = NULL;