...once the loop reaches an SwDropDownFieldType (whose GetName() is empty), and
m_pCategoryBox->GetText() is empty (which it appears is always the case here in
the constructor?), as e.g. happens when opening Writer's "Tools - Options... -
LibreOffice Writer - AutoCaption".

Change-Id: I11128981f32691158e1d5de74117c1b1a9d5fea4