Fix: ColorPicker Binding failed

[Poker-sang]

GridView.SelectedValue to null is transient behavior. It does not affect the original ColorPicker behavior.

Fixes

closes: #414

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs
• New component
  • Documentation has been added
  • Sample in sample app has been added
  • Analyzers are passing for documentation and samples
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• Tests for the changes have been added (if applicable)
• Header has been added to all new source files
• Contains NO breaking changes

Other information

[Arlodotexe]

Looks like the latest CI error is:

       "C:\a\Windows\Windows\tooling\ProjectHeads\AllComponents\Uwp\CommunityToolkit.App.Uwp.csproj" (default target) (56:6) ->
       (BuildNativePackage target) -> 
         C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.12-rel-31116-00\tools\Microsoft.NetNative.targets(809,5): warning :       MCG : warning MCG0001: [MarshalAs(UnmanagedType=(Default), ElementType=(Default))] with type 'Microsoft.DiaSymReader.VariantStructure' is not supported.This signature is located on 'System.Void Microsoft.DiaSymReader.ISymUnmanagedWriter5.DefineConstant2(System.String, Microsoft.DiaSymReader.VariantStructure, System.Int32)'. [C:\a\Windows\Windows\tooling\ProjectHeads\AllComponents\Uwp\CommunityToolkit.App.Uwp.csproj]
         C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.12-rel-31116-00\tools\Microsoft.NetNative.targets(809,5): warning :       MCG : warning MCG0007: Unresolved P/Invoke method 'Microsoft.DiaSymReader.Native.x86.dll!CreateSymReader' for method 'System.Void Microsoft.DiaSymReader.SymUnmanagedFactory.CreateSymReader32(System.Guid, System.Object)'. Calling this method would throw exception at runtime. Please make sure the P/Invoke either points to a Windows API allowed in UWP applications, or a native DLL that is part of the package. If for some reason your P/Invoke does not satisfy those requirements, please use [DllImport(ExactSpelling=true) to indicate that you understand the implications of using non-UWP APIs. [C:\a\Windows\Windows\tooling\ProjectHeads\AllComponents\Uwp\CommunityToolkit.App.Uwp.csproj]

Rerunning, let's see if it's consistent.

[Arlodotexe]

For some reason only the android target threw this error, but it'll need to be fixed:

       "D:\a\Windows\Windows\components\ColorPicker\src\CommunityToolkit.WinUI.Controls.ColorPicker.csproj" (Build target) (9:18) ->
       (CoreCompile target) -> 
         D:\a\Windows\Windows\components\ColorPicker\src\Converters\NullToTransparentConverter.cs(7,22): error CS1591: Missing XML comment for publicly visible type or member 'NullToTransparentConverter' [D:\a\Windows\Windows\components\ColorPicker\src\CommunityToolkit.WinUI.Controls.ColorPicker.csproj::TargetFramework=net9.0-android]
         D:\a\Windows\Windows\components\ColorPicker\src\Converters\NullToTransparentConverter.cs(9,19): error CS1591: Missing XML comment for publicly visible type or member 'NullToTransparentConverter.Convert(object, Type, object, string)' [D:\a\Windows\Windows\components\ColorPicker\src\CommunityToolkit.WinUI.Controls.ColorPicker.csproj::TargetFramework=net9.0-android]
         D:\a\Windows\Windows\components\ColorPicker\src\Converters\NullToTransparentConverter.cs(11,19): error CS1591: Missing XML comment for publicly visible type or member 'NullToTransparentConverter.ConvertBack(object?, Type, object, string)' [D:\a\Windows\Windows\components\ColorPicker\src\CommunityToolkit.WinUI.Controls.ColorPicker.csproj::TargetFramework=net9.0-android]