tests(inputvalidate): remove undefined

Author: misterdev

packages/webpack-scaffold/__tests__/__snapshots__/index.test.ts.snap

@@ -2,7 +2,6 @@
 
 exports[`utils Inquirer should make an Input object with validation 1`] = `
 Object {
-  "default": undefined,
   "message": "what is your plugin?",
   "name": "plugins",
   "type": "input",

packages/webpack-scaffold/__tests__/index.test.ts

@@ -76,7 +76,6 @@ describe("utils", () => {
 		});
 		it("should make an Input object", () => {
 			expect(utils.Input("plugins", "what is your plugin?")).toEqual({
-				default: undefined,
 				message: "what is your plugin?",
 				name: "plugins",
 				type: "input",

packages/webpack-scaffold/index.ts

@@ -92,13 +92,14 @@ export function InputValidate(
 		defaultChoice?: string,
 	): Generator.Question {
 
-	return {
-		default: defaultChoice,
+	const input: Generator.Question = {
 		message,
 		name,
 		type: "input",
 		validate: cb
 	};
+	if (defaultChoice !== undefined) input.default = defaultChoice;
+	return input;
 }
 
 export function Confirm(name: string, message: string, defaultChoice: boolean = true): Generator.Question {