Ensure that we don't get unexpected output files for tests that throw. (#8208)

packages/babel-plugin-transform-classes/test/fixtures/spec/super-call-only-allowed-in-derived-constructor/output.js

@@ -1,9 +0,0 @@
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-let Foo = function Foo() {
-  "use strict";
-
-  _classCallCheck(this, Foo);
-
-  super();
-};