we don't have empty previewstacks any more - code cleaned up
we don't have empty previewstacks any more - code cleaned up

bluelml/core,phil-davis/core,michaelletzgus/nextcloud-server,IljaN/core,endsguy/server,pixelipo/server,Ardinis/server,andreas-p/nextcloud-server,whitekiba/server,cernbox/core,Ardinis/server,cernbox/core,jbicha/server,IljaN/core,andreas-p/nextcloud-server,owncloud/core,pixelipo/server,lrytz/core,nextcloud/server,bluelml/core,IljaN/core,bluelml/core,michaelletzgus/nextcloud-server,michaelletzgus/nextcloud-server,IljaN/core,whitekiba/server,cernbox/core,cernbox/core,IljaN/core,owncloud/core,endsguy/server,pmattern/server,jbicha/server,pixelipo/server,lrytz/core,lrytz/core,xx621998xx/server,michaelletzgus/nextcloud-server,xx621998xx/server,sharidas/core,endsguy/server,whitekiba/server,bluelml/core,pollopolea/core,pixelipo/server,pixelipo/server,pmattern/server,xx621998xx/server,whitekiba/server,xx621998xx/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,owncloud/core,cernbox/core,owncloud/core,lrytz/core,nextcloud/server,Ardinis/server,pmattern/server,nextcloud/server,pmattern/server,sharidas/core,nextcloud/server,xx621998xx/server,endsguy/server,pollopolea/core,lrytz/core,jbicha/server,endsguy/server,andreas-p/nextcloud-server,pmattern/server,pollopolea/core,sharidas/core,sharidas/core,Ardinis/server,Ardinis/server,bluelml/core,jbicha/server,sharidas/core,pollopolea/core,whitekiba/server,owncloud/core,jbicha/server,pollopolea/core