handle NoUserException in sharing code
handle NoUserException in sharing code

* setup LDAP users
* share from an LDAP user
* delete that LDAP user
* log in as share recipient
* before: unhandled NoUserException
* after: NoUserEception is logged and share is not shown anymore

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