LDAP: get rid of some PHP Warnings
LDAP: get rid of some PHP Warnings

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