Seeing this error in the log occasionally.
08:49:04 ERROR: Couldn't find template for digesting: catalog/item_options_download_
I think it has to do with the way templates are being called: app/views/catalog/_item_options_download.html.erb
<%= render partial: 'item_options_download_' + @document.display_format, locals: local_assigns %>
It may happen when @display_format is null?