It's not possible to select an Empty Content Scheduler block - there is nothing to hover over/select in Page Builder edit mode.

Steps to reproduce:
1. Login as admin
2. Go to Page
3. Create a new LP
4. Add Content Scheduler block
5. Add a single Content Item in the future
6. Publish the Landing Page
7. Go to Edit Mode again

Expected:
Content Scheduler block can be selected.

Actual:
Content Scheduler block cannot be selected - it has 0px height and user cannot interact with it.

Remarks:
The same happens with Embed block - example flow in https://jira.ez.no/browse/EZP-29359.