[MacOS] FIx agains NRE on disposing Entry renderer (#8019)

Xamarin.Forms.Platform.MacOS/Renderers/EntryRenderer.cs

@@ -240,11 +240,17 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdateAlignment()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			Control.Alignment = Element.HorizontalTextAlignment.ToNativeTextAlignment(((IVisualElementController)Element).EffectiveFlowDirection);
 		}
 
 		void UpdateColor()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			var textColor = Element.TextColor;
 
 			if (textColor.IsDefault || !Element.IsEnabled)
@@ -263,11 +269,17 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdateFont()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			Control.Font = Element.ToNSFont();
 		}
 
 		void UpdatePlaceholder()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			var formatted = (FormattedString)Element.Placeholder;
 
 			if (formatted == null)
@@ -285,11 +297,16 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		protected override void SetAccessibilityLabel()
 		{
+			if (IsElementOrControlEmpty)
+				return;
 			Control.AccessibilityLabel = (string)Element?.GetValue(AutomationProperties.NameProperty) ?? Control.PlaceholderAttributedString?.Value;
 		}
 
 		void UpdateText()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			// ReSharper disable once RedundantCheckBeforeAssignment
 			if (Control.StringValue != Element.Text)
 				Control.StringValue = Element.Text ?? string.Empty;
@@ -297,6 +314,9 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdateMaxLength()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			var currentControlText = Control?.StringValue;
 
 			if (currentControlText.Length > Element?.MaxLength)
@@ -306,6 +326,9 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdateIsReadOnly()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			Control.Editable = !Element.IsReadOnly;
 			if (Element.IsReadOnly && Control.Window?.FirstResponder == Control.CurrentEditor)
 				Control.Window?.MakeFirstResponder(null);

Xamarin.Forms.Platform.iOS/Renderers/LabelRenderer.cs

@@ -445,6 +445,9 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdateTextHtml()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			string text = Element.Text ?? string.Empty;
 
 #if __MOBILE__
@@ -574,6 +577,9 @@ namespace Xamarin.Forms.Platform.MacOS
 
 		void UpdatePadding()
 		{
+			if (IsElementOrControlEmpty)
+				return;
+
 			if (Element.Padding.IsEmpty)
 				return;