allow empty configvalue in appconfig
allow empty configvalue in appconfig

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