Media/Block still appears in lower pane after its folder moved to trash

Description

Steps to reproduce:

1. Create some blocks/media under a folder F1.
2. Open Edit Approval Sequence of F1.
3. Move F1 to trash.

Expected:
Move successful. The selected folder is For All Site & display items under this folder in the lower pane.

Actual:
Move to trash is successful. No folder is selected. Items under F1 are still displayed under the lower pane.

Note: The same problem occurs when opening a block in editing in step #2