Fix warning with unset extension check
Fix warning with unset extension check

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