Validate bookmark inputs, fixes bug oc-636
Validate bookmark inputs, fixes bug oc-636

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