message: Fix crash when clicking on item with plurals in POT
diff: @@ -775,7 +775,7 @@ void EditingArea::UpdateToTextCtrl(CatalogItemPtr item, int flags)
  SetTranslationValue(m_textTransPlural[i], item->GetTranslation(i), flags);
  }
  - if (flags & EditingArea::ItemChanged)
  + if ((flags & EditingArea::ItemChanged) && m_pluralNotebook)
  m_pluralNotebook->SetSelection(0);
  }
  else
  