Commits on Nov 27, 2015

1. Fixes a crash caused by NaNs in CombinedChartView when an empty datas… …

   …et is passed in.
   
   Also fixes a simlar NaN-related crash when such a chart is touched.
   
   A minimal view controller to reproduce is:
   
   import UIKit
   import Charts
   
   class InformationViewController: UIViewController {
       @IBOutlet weak var chartView: CombinedChartView!
   
       override func viewDidLoad() {
           let xAxisData = [NSDate]()
           let bar1Data = BarChartDataSet(yVals: [BarChartDataEntry]())
           let bar2Data = BarChartDataSet(yVals: [BarChartDataEntry]())
   
           chartView.xAxis.labelPosition = .Bottom
           chartView.descriptionText = ""
           chartView.animate(xAxisDuration: 0.5, yAxisDuration: 1.0)
   
           let combinedData = CombinedChartData(xVals: xAxisData)
           combinedData.barData = BarChartData(xVals: xAxisData, dataSets: [bar1Data, bar2Data])
   
           chartView.data = combinedData
       }
   }

   

   natethegreat44 committed Nov 27, 2015
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