fdo#79008 Crash: File getting crash while saving in LO

File is getting crashed while saving in LO, as it tries
to access the value of vector after erasing that value.
Code changed to access the vector value first and
then erase that value from vector.

Change-Id: I29369b7582fdbd7363d0e6fdae091a30c79a747d
Reviewed-on: https://gerrit.libreoffice.org/9433
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
(cherry picked from commit ed3fd76b65b2a281effea55b8a55101a8b740aec)

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx