Avoid a divide by zero if there's no messages to send.

Signed-off-by: Junio C Hamano <junkio@cox.net>

imap-send.c

@@ -1332,14 +1332,19 @@ main(int argc, char **argv)
 		return 1;
 	}
 
+	total = count_messages( &all_msgs );
+	if (!total) {
+		fprintf(stderr,"no messages to send\n");
+		return 1;
+	}
+
 	/* write it to the imap server */
 	ctx = imap_open_store( &server );
 	if (!ctx) {
 		fprintf( stderr,"failed to open store\n");
 		return 1;
 	}
 
-	total = count_messages( &all_msgs );
 	fprintf( stderr, "sending %d message%s\n", total, (total!=1)?"s":"" );
 	ctx->name = imap_folder;
 	while (1) {