Fixed a null pointer exception.

Author: superqiaopu

CoreLibrary/src/main/java/com/didi/virtualapk/delegate/LocalService.java

@@ -84,6 +84,11 @@ public int onStartCommand(Intent intent, int flags, int startId) {
 
         ComponentName component = target.getComponent();
         LoadedPlugin plugin = mPluginManager.getLoadedPlugin(component);
+        
+        if (plugin == null) {
+            Log.w(TAG, "Error target: " + target.toURI());
+            return START_STICKY;
+        }
         // ClassNotFoundException when unmarshalling in Android 5.1
         target.setExtrasClassLoader(plugin.getClassLoader());
         switch (command) {