app/views/catalog/_thumbnail_list_default.html.erb
<%# [hyc-override] https://github.com/samvera/hyrax/blob/hyrax-v4.0.0/app/views/catalog/_thumbnail_list_default.html.erb %>
<%# [hyc-override] Add alt text for thumbnails @todo can be removed when fixed upstream %>
<% model = document.hydra_model %>
<div class="col-md-3">
<% if model == Hyrax::PcdmCollection || model < Hyrax::PcdmCollection %>
<%= document_presenter(document)&.thumbnail&.thumbnail_tag({ alt: "Thumbnail for #{document.title_or_label}"}, suppress_link: true) %>
<% else %>
<div class="list-thumbnail">
<%= document_presenter(document)&.thumbnail&.thumbnail_tag({ alt: "Thumbnail for #{document.title_or_label }" }) %>
</div>
<% end %>
</div>