suppress error when using is_dir on non directory in smb backend
suppress error when using is_dir on non directory in smb backend

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