don't display answers with no content
don't display answers with no content

fixes #244

istvan-antal/open-data-certificate,istvan-antal/open-data-certificate,ahmadassaf/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,theodi/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,istvan-antal/open-data-certificate,ahmadassaf/open-data-certificate,zoul/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate