message: Fix crash when updating changes catalog size
diff: @@ -643,7 +643,7 @@ void PoeditListCtrl::CatalogChanged(const CatalogPtr& catalog)
  {
  wxWindowUpdateLocker no_updates(this);
  - const int oldCount = m_catalog ? m_catalog->GetCount() : 0;
  + const int oldCount = m_model->GetCount();
  const int newCount = catalog ? catalog->GetCount() : 0;
  const bool isSameCatalog = (catalog == m_catalog);
  const bool sizeOrCatalogChanged = !isSameCatalog || (oldCount != newCount);
  