fix cleanup error when instance has no data

yyx990803 · yyx990803 · commit 9476ce9d1224 · 2016-05-05T11:01:10.000-04:00
diff --git a/src/instance/internal/lifecycle.js b/src/instance/internal/lifecycle.js
@@ -244,7 +244,7 @@ export default function (Vue) {
     }
     // remove reference from data ob
     // frozen object may not have observer.
-    if (this._data.__ob__) {
+    if (this._data && this._data.__ob__) {
       this._data.__ob__.removeVm(this)
     }
     // Clean up references to private properties and other

Original file line number	Diff line number	Diff line change
`@@ -244,7 +244,7 @@ export default function (Vue) {`
`244`	`244`	`}`
`245`	`245`	`// remove reference from data ob`
`246`	`246`	`// frozen object may not have observer.`
`247`		`- if (this._data.__ob__) {`
	`247`	`+ if (this._data && this._data.__ob__) {`
`248`	`248`	`this._data.__ob__.removeVm(this)`
`249`	`249`	`}`
`250`	`250`	`// Clean up references to private properties and other`