Without populating the clip document, copying a chart (or charts) into
clipboard makes the charts lose all their referenced data, which causes
the pasted chart to appear empty.

Conflicts:
	sc/source/ui/view/drawvie4.cxx

Change-Id: I0e7ce7cfbcdb3c9f120c6f0c72c58ab320901e6b
Reviewed-on: https://gerrit.libreoffice.org/1757Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>