Here is a plunker showing the issue: http://embed.plnkr.co/QCVsu4B8fXeKdOW9SpuM/
Click the 'toggle showLabels' button to set showLabels to 0 and click again to set it back.
Also see the attached picture for another example.
Bug Description:
When showLabels is set to 0 after a horizontal bar chart is loaded with AngularJS, the labels are not removed from the chart area, and instead remain behind the chart's area.