fix(vue): Make vue parser tolerant of components that don't contain scripts (#1061)

Fixes #1060

Author: tmcw

__tests__/__snapshots__/test.js.snap

@@ -558,6 +558,8 @@ Array [
 ]
 `;
 
+exports[`Vue file 2`] = `Array []`;
+
 exports[`config 1`] = `
 "<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
 

__tests__/fixture/vue-no-script.input.vue

@@ -0,0 +1,7 @@
+<template>
+  <div>not relevant</div>
+</template>
+
+<style>
+
+</style>

__tests__/test.js

@@ -242,6 +242,16 @@ test('Vue file', async function() {
   expect(data).toMatchSnapshot();
 });
 
+test('Vue file', async function() {
+  await pify(chdir)(__dirname);
+  const data = await documentation.build(
+    '__tests__/fixture/vue-no-script.input.vue',
+    {}
+  );
+  normalize(data);
+  expect(data).toMatchSnapshot();
+});
+
 test('Use Source attribute only', async function() {
   await pify(chdir)(__dirname);
   const documentationSource = `

src/parsers/vue.js

@@ -12,7 +12,9 @@ const vuecompiler = require('vue-template-compiler');
  * @returns {Array<Object>} an array of parsed comments
  */
 function parseVueScript(data: Object, config: DocumentationConfig) {
-  data.source = vuecompiler.parseComponent(data.source).script.content;
+  const component = vuecompiler.parseComponent(data.source);
+  if (!component.script) return [];
+  data.source = component.script.content;
   return parseJavaScript(data, config);
 }