ever since

commit e0bc1ab9
Date:   Mon Oct 4 16:54:47 2004 +0000

    INTEGRATION: CWS mav09 (1.42.58); FILE MERGED

SdrOle2Obj::SetObjRef calls mpImpl->mxObjRef.Clear();
so SdrOle2Obj::Disconnect_Impl cannot removeobj the
object from the olecache, i.e.

if ( mpImpl->mxObjRef.is() && mpImpl->mxLightClient.is() )
    ...
    GetSdrGlobalData().GetOLEObjCache().RemoveObj(this);
    ...

so the object remains in the cache and later on is dereferenced
with the usual sad results.

So, this band-aid ensures that if we get to the dtor and are still in the cache
we get removed.

Change-Id: Icf519e4db3eadf1c0d9acb7751dbea9cc04ca382
Reviewed-on: https://gerrit.libreoffice.org/52667Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>