Inventory search results display has wide margin at bottom

Steps to reproduce:

1. Log into any environment as diku_admin
2. Click open Inventory
3. View results without applying any filters
4. Results fill entire page
5. Scroll down to view more results

Expected results: Entire screen fills with additional matching results

Actual Results: More results are loaded, but they don't fill the entire page. There seems to be a wide, white margin at the bottom of the list. See screencast: https://www.screencast.com/t/BK91jcfSWQ94

Note: If you can't repro with above steps, you may need to do some additional clicking around first. Try this:

1. Go to users and find a user with open loans
2. Click to view the open loans
3. Click the "..." menu for one of the open loans and select item details
4. This will take you to the item in Inventory
5. Close the item record and the preview pane for the instance record
6. At this point, you should start to see the wide margin issue at the bottom of the search results if you didn't see it before

Additional results: This problem seems worse the more records are in the file. Not so bad in http://folio-testing.aws.indexdata.com but there are only 1467 records. Bad in https://demo.folio.ebsco.com, which currently has 47,000 +.