Fix abstract-hiding bug
Fix abstract-hiding bug

This fixes a bug that displayed an item's abstract as an empty string if there was  no extra bibliographic details to display in its accordion.
aha01/PubViz,alex-rind/PubViz,aha01/PubViz,fhstp/PubViz,alex-rind/PubViz,fhstp/PubViz