fix: don't generate <title> tag if metaInfo.title is null or false (#409)

test/unit/escaping.test.js

@@ -39,6 +39,31 @@ describe('escaping', () => {
     })
   })
 
+  test('null title is left as it is', () => {
+    const component = new Vue({
+      metaInfo: {
+        title: null
+      }
+    })
+
+    expect(getMetaInfo(component, [[/&/g, '&']])).toEqual({
+      title: null,
+      titleChunk: '',
+      titleTemplate: '%s',
+      htmlAttrs: {},
+      headAttrs: {},
+      bodyAttrs: {},
+      meta: [],
+      base: [],
+      link: [],
+      style: [],
+      script: [],
+      noscript: [],
+      __dangerouslyDisableSanitizers: [],
+      __dangerouslyDisableSanitizersByTagID: {}
+    })
+  })
+
   test('special chars are escaped unless disabled by vmid', () => {
     const component = new Vue({
       metaInfo: {

test/unit/generators.test.js

@@ -1,6 +1,7 @@
 import _generateServerInjector from '../../src/server/generateServerInjector'
 import { defaultOptions } from '../../src/shared/constants'
 import metaInfoData from '../utils/meta-info-data'
+import { titleGenerator } from '../../src/server/generators'
 
 const generateServerInjector = (type, data) => _generateServerInjector('test', defaultOptions, type, data)
 
@@ -59,3 +60,10 @@ describe('generators', () => {
     })
   })
 })
+
+describe('title generator should return an empty string when title is null', () => {
+  const title = null
+  const generatedTitle = titleGenerator(0, {}, 'title', title)
+
+  expect(generatedTitle.text()).toEqual('')
+})