Parse RequestContext and set default for null context

[live1206]

azure-sdk-for-net/sdk/core/Azure.Core/src/Shared/HttpPipelineExtensions.cs

Lines 84 to 92 in e99b8be

	private static (CancellationToken CancellationToken, ErrorOptions ErrorOptions) ApplyRequestContext(RequestContext? requestContext)
	{
	if (requestContext == null)
	{
	return (CancellationToken.None, ErrorOptions.Default);
	}
	return (requestContext.CancellationToken, requestContext.ErrorOptions);
	}