API Delete method in express.js Error

How to handle Delete Query When id not available in App.delete method not giving error .in both case show success. if id not available then it should output id not available to delete task . same case for get by id method . if id is available it working right . if id not available it did not show error

const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const mysql = require('mysql');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
    extended: true
}));

// connection configurations
const mc = mysql.createConnection({
    host: 'localhost',
    user: 'root',
    password: '',
    database: '1234'
});

// connect to database
mc.connect();

// default route
app.get('/', function (req, res) {
    return res.send({ error: true, message: 'hello' })
});

// Retrieve all todos 
app.get('/todos', function (req, res) {
    mc.query('SELECT * FROM tasks', function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'Todos list.' });
    });
});

// Search for todos with ‘bug’ in their name
app.get('/todos/search/:keyword', function (req, res) {
    let keyword = req.params.keyword;
    mc.query("SELECT * FROM tasks WHERE task LIKE ? ", ['%' + keyword + '%'], function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'Todos search list.' });
    });
});

// Retrieve todo with id 
app.get('/todo/:id', function (req, res) {

    let task_id = req.params.id;

    mc.query('SELECT * FROM tasks where id=?', task_id, function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results[0], message: 'Todos list.' });
    });

});

// Add a new todo  
app.post('/todo', function (req, res) {

    let task = req.body.task;

    if (!task) {
        return res.status(400).send({ error:true, message: 'Please provide task' });
    }

    mc.query("INSERT INTO tasks SET ? ", { task: task }, function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'New task has been created successfully.' });
    });
});

//  Update todo with id
app.put('/todo', function (req, res) {

    let task_id = req.body.task_id;
    let task = req.body.task;

    if (!task_id || !task) {
        return res.status(400).send({ error: task, message: 'Please provide task and task_id' });
    }

    mc.query("UPDATE tasks SET task = ? WHERE id = ?", [task, task_id], function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'Task has been updated successfully.' });
    });
});

//  Delete todo
app.delete('/todo/:id', function (req, res) {

    let task_id = req.params.id;

    if (!task_id) {
        return res.status(400).send({ error: true, message: 'Please provide text_id' });
    }
    mc.query('DELETE FROM tasks WHERE id = ?', task_id, function (error, results, fields) {
        if (error) throw error;
        return res.send({ error: false, data: results, message: 'text has been Deleted successfully.' });
    });
});

// all other requests redirect to 404
app.all("*", function (req, res) {
    return res.status(404).send('page not found')
});

// port must be set to 8080 because incoming http requests are routed from port 80 to port 8080
app.listen(8080, function () {
    console.log('Node app is running on port 8080');
});

// allows "grunt dev" to create a development server with livereload
//module.exports = app;