Until now the export of OLE objects was being done adding them to the
m_postponedOLE member and reading that member when the run properties
are closed, but it can happen that we receive an OLE object while not
in the middle of the row properties.

We have extracted the code that actually does the export to a
separate method and call it if m_postponedOLE is not available.

Some lines are incorrectly indented to make the purpose of this patch
more evident, and will be corrected in the next patch.

Change-Id: I3e0d785c99c659ec35d0c02dfc52367dcb6880b7