Openlibrary: Books without covers not showing title/author in carousels on 3+ page

Books which don't have covers should show title/author even if on 3+ page of carousel.

Evidence / Screenshot (if possible)

Relevant url?

e.g. https://openlibrary.org/publishers/John_Bartholomew_&_Son

Steps to Reproduce

1. Go to https://openlibrary.org/publishers/John_Bartholomew_&_Son
2. Scroll forward 2 pages

• Actual: Books display empty covers
• Expected: Books to still show the gray "placeholder" cover if missing cover

Details

• Logged in (Y/N)? Y
• Browser type/version? FF71
• Operating system? Win10
• Environment (prod/dev/local)? prod
  

Proposal & Constraints

• Create a jsdef block with the template in https://github.com/internetarchive/openlibrary/blob/caff690d44794f93866f9e48dca4f4858da53d13/openlibrary/templates/books/custom_carousel.html and use it in https://github.com/internetarchive/openlibrary/blob/f9ac7d477140988592744bb104cf8a39b179b35c/openlibrary/plugins/openlibrary/js/carousel/Carousel.js

Related files

• See the files here: https://github.com/internetarchive/openlibrary/pull/2729/files ; but the template rendering the covers when dynamically loaded is likely in the JS
• https://github.com/internetarchive/openlibrary/blob/f9ac7d477140988592744bb104cf8a39b179b35c/openlibrary/plugins/openlibrary/js/carousel/Carousel.js

Stakeholders