Null Exception when User X's out of the login process

MSALClientHelper.cs line 164 or there abouts.

Last line of the methhid SignInUserAndAcquireAccessToken this.AuthResult.AccessToken; throws a null exception because this.AuthResult is null when the user X's out of the login process. Is this by design and we should wrap the call with a try catch? Or should this be caught in the method and handled... or throw a new exception "User Closed Login Process"?

Thanks
Brady

```
public async Task SignInUserAndAcquireAccessToken(string[] scopes)
{
Exception.ThrowOn(() => this.PublicClientApplication == null, PCANotInitializedExceptionMessage);

var existingUser = await FetchSignedInUserFromCache().ConfigureAwait(false);

try
{
// 1. Try to sign-in the previously signed-in account
if (existingUser != null)
{
this.AuthResult = await this.PublicClientApplication
.AcquireTokenSilent(scopes, existingUser)
.ExecuteAsync()
.ConfigureAwait(false);
}
else
{
this.AuthResult = await SignInUserInteractivelyAsync(scopes);
}
}
catch (MsalUiRequiredException ex)
{
// A MsalUiRequiredException happened on AcquireTokenSilentAsync. This indicates you need to call AcquireTokenInteractive to acquire a token interactively
Debug.WriteLine($"MsalUiRequiredException: {ex.Message}");

this.AuthResult = await this.PublicClientApplication
.AcquireTokenInteractive(scopes)
.ExecuteAsync()
.ConfigureAwait(false);
}
catch (MsalException msalEx)
{
Debug.WriteLine($"Error Acquiring Token interactively:{Environment.NewLine}{msalEx}");
}

return this.AuthResult.AccessToken;
}
```