[visualization-api] getSelection() method stopped working

[Simone Fracassa]

Hello, I noticed the getSelection() method is not working anymore in all of 
Tree Map Charts I've created since years. They've always worked, but 
suddenly the getSelection method stopped returning the row/column value of 
selected item.

I tried this debugging handler and it returns "nothing", when normally, in 
Tree Map case, it should return the row value: getSelection()[0].row


function selectHandlerTree() {
           var selection = tree.getSelection();
  var message = '';

  for (var i = 0; i < selection.length; i++) {
    var item = selection[i];
    if (item.row != null && item.column != null) {
      message += '{row:' + item.row + ',column:' + item.column + '}';
    } else if (item.row != null) {
      message += '{row:' + item.row + '}';
    } else if (item.column != null) {
      message += '{column:' + item.column + '}';
    }
  }
  if (message == '') {
    message = 'nothing';
  }
  alert('You selected ' + message);
        }
              
Thanks.

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