Fix passing invalid points to CoreGraphics when building trend history graph

Tusker/Views/TrendHistoryView.swift

@@ -42,7 +42,10 @@ class TrendHistoryView: UIView {
     
     private func createLayers() {
         guard let history = history,
-              history.count >= 2 else { return }
+              history.count >= 2,
+              !bounds.isEmpty else {
+            return
+        }
         
         let maxUses = history.max(by: { $0.uses < $1.uses })!.uses