DomainMapper_Impl::AddDummyParaForTableInSection: shapes can't have sections

Change-Id: I9f90b515171ce4b498de49c2381b7324002e3c20
SwTextBoxHelper::syncProperty(): avoid crash on not-yet-inserted shape

Change-Id: Ic5d6a62ec3ba2e096e9257ab7d30004cf3213069