apps/contacts: only display buttons if there is a contact
apps/contacts: only display buttons if there is a contact

If you don't have any contacts, it would display a non-functioning
delete button.

Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@xinu.at>

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