Remove unneeded eslint disables and empty functions

lib/Account.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-empty-function, getter-return */
 'use strict';
 
 const Class = require('./Class');

lib/Class.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-empty-function */
 'use strict';
 
 const crypto = require('crypto');
@@ -307,10 +306,6 @@ class Class {
 		}
 	}
 
-	calculateAverageMovement() {
-
-	}
-
 	static async createClass(conn, accountId, name, subjectId) {
 		const s = await new Subject(conn, subjectId);
 		const a = await new (require('./Account'))(conn, accountId);

lib/Parent.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-empty-function, getter-return */
 'use strict';
 
 const User = require('./User');

lib/Student.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-empty-function, getter-return */
 'use strict';
 
 const User = require('./User');

lib/TestTemplate.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-empty-function, getter-return */
 'use strict';
 
 const crypto = require('crypto');