return markout empty if there is no quit marker: fixes #151
return markout empty if there is no quit marker: fixes #151

IrinaNicolae/bbci_public,drsternburg/bbci_public,IrinaNicolae/bbci_public,IrinaNicolae/bbci_public,bbci/bbci_public,bbci/bbci_public,bbci/bbci_public,svendaehne/bbci_public,svendaehne/bbci_public,svendaehne/bbci_public,drsternburg/bbci_public,drsternburg/bbci_public