Updated the review suggestions.

Author: DhanarajRajendran

maui/src/Charts/Series/CartesianSeries.cs

@@ -1793,7 +1793,7 @@ internal double[] GetCardinalSpline(List<double> xValues, IList<double> yValues)
 
 		internal override void UpdateEmptyPointSettings()
 		{
-			if (!IsFillEmptyPoint && EmptyPointMode == EmptyPointMode.None)
+			if (!IsFillEmptyPoint || EmptyPointMode == EmptyPointMode.None)
 			{
 				return;
 			}

maui/src/Charts/SfCartesianChart.cs

@@ -1960,14 +1960,19 @@ void ScheduleUpdateChart()
         void ResetAnnotation()
         {
 			int i = _annotationLayout.Children.Count - 1;
-			if (i < 0)	return;
+
+			if (i < 0)
+			{
+				return;
+			}
 
 			do
 			{
 				if (_annotationLayout.Children[i] is not AnnotationDrawableView view)
 				{
 					_annotationLayout.Children.RemoveAt(i);
 				}
+
 				i--;
 			} while (i >= 0);
 		}