Fixed readFromDB error might cause excpection

Author: jackycute

lib/db.js

@@ -85,7 +85,8 @@ function readFromDB(id, callback) {
             } else {
                 //logger.info(result.rows);
                 if (result.rows.length <= 0) {
-                    callback("not found note in db: " + util.inspect(id), null);
+                    callback("not found note in db", null);
+                    return logger.error("not found note in db: " + id, err);
                 } else {
                     if(config.debug)
                         logger.info("read from db success");