Do not dispatch axis event if axis data is not available (#337)

Axis afterSetExtremes is meaningless if axis is not defined.
Also helps prevent flow#3102
Fixes CHARTS-778

test/element-events-test.html

@@ -161,6 +161,18 @@
  timelineChart.addEventListener('yaxes-extremes-set', setExtremesListener);
  timelineChart.configuration.yAxis[0].setExtremes(minExtreme, maxExtreme);
  });
+
+ it('should not trigger axis event if axis is hidden by action', done => {
+ const axisResizeSpy = sinon.spy(); 
+ chart.addEventListener('yaxes-extremes-set', axisResizeSpy);
+ chart.configuration.series[0].setVisible(false);
+ setTimeout(() => {
+ expect(axisResizeSpy.called).to.be.false;
+ chart.removeEventListener('chart-redraw', axisResizeSpy);
+ chart.configuration.series[0].setVisible(true);
+ done();
+ });
+ });
  });
  </script>
 </body>

vaadin-chart.html

@@ -852,6 +852,11 @@
  }
  };
 
+ if (event.type === 'afterSetExtremes') {
+ if (!event.min || !event.max) {
+ return;
+ }
+ }
  // Workaround for vaadin-charts-flow because of https://github.com/vaadin/flow/issues/3102
  if (event.type === 'selection') {
  if (event.xAxis && event.xAxis[0]) {