fix initial location handling in abstract mode

Author: yyx990803

src/history/abstract.js

@@ -48,4 +48,8 @@ export class AbstractHistory extends History {
     this.stack = [this.current]
     this.index = 0
   }
+
+  getLocation () {
+    return '/'
+  }
 }

src/index.js

@@ -95,8 +95,12 @@ export default class VueRouter {
   }
 
   setInitialLocation (location: RawLocation) {
+    const route = this.match(location)
     if (this.history instanceof AbstractHistory) {
-      this.history.setInitialRoute(this.match(location))
+      this.history.setInitialRoute(route)
+    }
+    if (this.app) {
+      this.app._route = route
     }
   }
 }