title: Additional empty row in QSqlTableModel
body: <p>I'm trying to add always-empty last row. Now I have proxy model, on which I'm calling insertRow() - the row is inserted. But I need to add another row, when last row is updated (data is inserted). To which signal should I connect?</p>
  
  <p>Weird error occurs sometimes - when clicking on existing row, data are copied to last row. Do you have idea what can be wrong?</p>
  
  <p>Thanks for help</p>