Need to implement error first callback

[helenzhou6]

HEII-topics/src/handler.js

Lines 156 to 159 in 5a2f685

	getUserData(username, (err, dbResponse) => {
	const user = dbResponse[0];
	if (user) {
	bcrypt.compare(password, user.password, (err, compare) => {

And

HEII-topics/src/handler.js

Lines 193 to 203 in 5a2f685

	getUserData(username, (err, res) => {
	if (!res) {
	addErrorCookie(
	response,
	'bad luck, that username is already taken, pick another!'
	);
	} else {
	bcrypt.hash(password, 8, (err, hashedPassword) => {
	if (err) {
	console.log(err);
	}

--> These functions need error handling at the beginning

if(err) {
   addErrorCookie(response, 'sorry there was en error on our end trying to process your request');
} else {
 // do this
}