Remove notice and fix redirection when deleting a page.

#6155 

Now when deleting a page notice is gone:
![selection_188](https://cloud.githubusercontent.com/assets/4497748/3037284/b3f03180-e0bb-11e3-934a-19cde148cd57.png)

After deleting a page we redirection is fixed:
![selection_190](https://cloud.githubusercontent.com/assets/4497748/3037318/658a93ea-e0bc-11e3-9c75-870a023e939e.png)