🐛 bug(observer): fix dep undefined error (#88) by @fandaa

Author: František Polášek

src/config.js

@@ -16,7 +16,7 @@ export default function (Vue, langVM, lang) {
 
     return function computedGetter () {
       watcher.dirty && watcher.evaluate()
-      Dep.target && watcher.depend()
+      Dep && Dep.target && watcher.depend()
       return watcher.value
     }
   }

src/observer.js

@@ -28,7 +28,7 @@ let Dep
  */
 
 export function getDep (vm) {
-  if (!Dep) {
+  if (!Dep && vm && vm._data && vm._data.__ob__ && vm._data.__ob__.dep) {
     Dep = vm._data.__ob__.dep.constructor
   }
   return Dep