Do not filemtime() on "." directory. Use empty string instead
Do not filemtime() on "." directory. Use empty string instead

Fix #9928

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