FIX : an error(arr2) are fixed

@@ -16,7 +16,6 @@ app.use(bodyParser.json());
 app.post('/hook', function (req, res) {
 
     var eventObj = req.body.events[0];
-    var source = eventObj.source;
     var message = eventObj.message;
 
     function output_message(results, list) {
@@ -64,6 +63,7 @@ app.post('/hook', function (req, res) {
     db.connect();
 
     var max = 0;
+    var arr2;
 
     db.query('SELECT * FROM recipe', function (error, results, fields) {
         if (error) {
@@ -77,7 +77,7 @@ app.post('/hook', function (req, res) {
             var count = ingredients_list.filter(x => input_ingredients_list.includes(x)).length;
             if (count > max) {
                 max = count;
-                var arr2 = new Array();
+                arr2 = new Array();
             }
             if (count === input_ingredients_list.length) {
                 arr1.push(i);
@@ -91,7 +91,7 @@ app.post('/hook', function (req, res) {
             output_message(results, arr1);
         }
 
-        else if (arr2.length != 0) {
+        else if (arr2 != undefined) {
             output_message(results, arr2);
         }
         else {