title: Get rid of text 'DataSet' in pieChart legend
body: <p>So, I've created a vc with a pieChart. The legend of the pieChart shows the word 'DataSet' behind it. It's not something I've deliberatly put in...
  Where does it come from, how do I get rid of it?</p>
  
  <p><a href="https://i.stack.imgur.com/rlnOg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rlnOg.png" alt="enter image description here"></a></p>
  
  <p>Here's my pieChart code:</p>
  
  <pre><code>fileprivate func setupPieChart() {
      let titleParagraphStyle = NSMutableParagraphStyle()
      titleParagraphStyle.alignment = .center
  
      let attributedCenterText = NSAttributedString(string:"Number of Reports", attributes:
          [NSAttributedString.Key.foregroundColor: Settings.shared.currentTheme.textColor, NSAttributedString.Key.paragraphStyle: titleParagraphStyle])
  
      self.pieChartView.backgroundColor = .clear
      self.pieChartView.centerAttributedText = attributedCenterText
      self.pieChartView.drawEntryLabelsEnabled = false
      self.pieChartView.highlightPerTapEnabled = false
      self.pieChartView.holeColor = .clear
      self.pieChartView.legend.textColor = Settings.shared.currentTheme.textColor
      self.pieChartView.usePercentValuesEnabled = false
  }
  
  fileprivate func setupPieChartData() {
      let dataSet = PieChartDataSet()
      dataSet.colors = ChartColorTemplates.material()
      dataSet.valueColors = [Settings.shared.currentTheme.textColor]
  
      for key in self.data.keys.sorted() {
          if let team = self.teamService.team(for: key), let reportCount = self.data[key]?.count {
              let entry = PieChartDataEntry(value: Double(reportCount), label: team.teamName)
              dataSet.append(entry)
          }
      }
  
      let data = PieChartData(dataSet: dataSet)
  
      let formatter = NumberFormatter()
      formatter.numberStyle = .decimal
      formatter.maximumFractionDigits = 0
      data.setValueFormatter(DefaultValueFormatter(formatter: formatter))
  
      self.pieChartData = data
  }
  </code></pre>