Consider using ternary operator to simplify code

[ecleary]

QuestionsAndAnswersAPI/server/models/model.js

Lines 9 to 13 in 9e8ff4f

	if (product_id) {
	queryToUse = `SELECT * FROM questions WHERE product_id = ${product_id} LIMIT ${(page || 1) * (count || 5) - (count || 5)}, ${(count || 5)}`;
	} else {
	queryToUse = `SELECT * FROM questions LIMIT ${(page || 1) * (count || 5) - (count || 5)}, ${(count || 5)}`;
	}

It would be possible to simplify this code and reduce repetition by using a ternary operator inside the query statement instead of putting the query statement inside of a conditional:

`SELECT * FROM questions WHERE ${product_id ? `product_id = ${product_id} ` : ''}LIMIT...`

If we use this format, then we can get by with writing the query only once.