No message about state of deleted content in right side panel.

Reproduce on HAP create-content branch after merged state management.

Scenario: 

1. Open some page.
2. in console delete document from that page.
3. Click edit content button for deleted document.

Expected: Message in right side panel: ""Content not found. The requested content has not been found. It may have been deleted since the page was rendered."

Current behavior: No message but progress bar only.