don't try to print the help text for a CLI command when RESULT_SHOWUSAGE is

returned if there is no help text available (issue #6604)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@11281 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cli.c

@@ -1363,7 +1363,10 @@ int ast_cli_command(int fd, char *s)
 			if (e) {
 				switch(e->handler(fd, x, argv)) {
 				case RESULT_SHOWUSAGE:
-					ast_cli(fd, "%s", e->usage);
+					if (e->usage)
+						ast_cli(fd, "%s", e->usage);
+					else
+						ast_cli(fd, "%s", "Invalid usage, but no usage information available.\n");
 					break;
 				}
 			} else