PM-3349 PM-3350 MAUI Migration Initial

src/Core/Utilities/IsNotNullConverter.cs

@@ -0,0 +1,25 @@
+using System;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui;
+
+namespace Bit.App.Utilities
+{
+    public class IsNotNullConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter,
+            System.Globalization.CultureInfo culture)
+        {
+            if (targetType == typeof(bool))
+            {
+                return value != null;
+            }
+            throw new InvalidOperationException("The target must be a boolean.");
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter,
+            System.Globalization.CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}