fix(core): Fixes handling of undefined paths in tsconfig generation.

test/test.ts

@@ -5,4 +5,9 @@ tap.test('first test', async () => {
   console.log(tspublish);
 });
 
+tap.test('should create a TsPublish instance', async () => {
+  const tspublishInstance = new tspublish.TsPublish();
+  expect(tspublishInstance).toBeTruthy();
+});
+
 tap.start();