Code review updates

Author: bummytime

WooCommerce/Classes/Model/OrderStats+Woo.swift

@@ -21,7 +21,7 @@ extension OrderStats {
 
     /// Returns the sum of total sales this stats period. This value is typically used in the dashboard for revenue reporting.
     ///
-    /// *Note:* The value returned here is an aggrigation of all the `OrderStatsItem.totalSales` values and
+    /// *Note:* The value returned here is an aggregation of all the `OrderStatsItem.totalSales` values and
     /// _not_ `OrderStats.totalGrossSales` or `OrderStats.totalNetSales`.
     ///
     var totalSales: Double {

WooCommerce/Classes/ViewRelated/Dashboard/MyStore/ChartMarker.swift

@@ -34,12 +34,12 @@ class ChartMarker: MarkerImage {
         var offset = self.offset
         var size = self.size
 
-        if size.width == 0.0 && image != nil {
-            size.width = image!.size.width
+        if let image = image, size.width == 0.0 {
+            size.width = image.size.width
         }
 
-        if size.height == 0.0 && image != nil {
-            size.height = image!.size.height
+        if let image = image, size.height == 0.0 {
+            size.height = image.size.height
         }
 
         let width = size.width

WooCommerce/Classes/ViewRelated/Dashboard/MyStore/PeriodDataViewController.swift

@@ -87,9 +87,7 @@ class PeriodDataViewController: UIViewController, IndicatorInfoProvider {
 //
 extension PeriodDataViewController {
     func clearAllFields() {
-        if barChartView != nil {
-            barChartView.clear()
-        }
+        barChartView?.clear()
         orderStats = nil
         siteStats = nil
         reloadAllFields()
@@ -185,7 +183,7 @@ extension PeriodDataViewController: ChartViewDelegate {
             return
         }
 
-        let marker: ChartMarker = ChartMarker(color: StyleManager.wooSecondary,
+        let marker = ChartMarker(color: StyleManager.wooSecondary,
                                               font: StyleManager.chartLabelFont,
                                               textColor: StyleManager.wooWhite,
                                               insets: Constants.chartMarkerInsets)