MsalProvider constructor crashes unless you pass scopes

[asklar]

Graph-Controls/CommunityToolkit.Authentication.Msal/MsalProvider.cs

Line 63 in d985141

public MsalProvider(IPublicClientApplication client, string[] scopes = null, bool autoSignIn = true)

the default value for scopes is null, but we unconditionally run the Select(...) on it. Fix would be to either not provide a default argument for scopes (since it's arguably needed), or at least use scopes?.Select(...) so that we don't end up with a null deref.
note there's 2 ctors with this issue

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