fix: avoid crashing when adding router via UI

yyx990803 · yyx990803 · commit 128d9d9217b6 · 2018-08-03T11:50:09.000-07:00
close #2034
diff --git a/packages/@vue/cli-service/generator/router/index.js b/packages/@vue/cli-service/generator/router/index.js
@@ -1,4 +1,4 @@
-module.exports = (api, options) => {
+module.exports = (api, options = {}) => {
   api.injectImports(api.entryFile, `import router from './router'`)
   api.injectRootOptions(api.entryFile, `router`)
   api.extendPackage({

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-module.exports = (api, options) => {`
	`1`	`+module.exports = (api, options = {}) => {`
`2`	`2`	api.injectImports(api.entryFile, `import router from './router'`)
`3`	`3`	api.injectRootOptions(api.entryFile, `router`)
`4`	`4`	`api.extendPackage({`