Note:
v1.12.0-beta2 is version tag for clean
If you want to use demo, use: v1.12.0-beta1
ezplatform-ee installed from 1.11 branch is not affected

Description:
When trying to generate preview for a Page with Collection Block whose only item is in Trash an error " Error occurred when getting landing page preview" occurs.

Steps to reproduce:
1. Create new Landing Page
2. Add Collection Block
3. Start adding Content
3. Create an Article using Content on The Fly
4. Submit block & publish LP
5. Go to view mode for created Article
6. Send it to trash
7. Go to created LP again
8. Switch to Edit mode
9. Switch to View mode

Described error occurs. In Edit Mode the block cannot be edited (menu does not appear after clicking it).

The following is available in network tag:
Request URL:http://sc.local/studio/preview/block
Request Method:POST
Status Code:404 Not Found