[Mono-list] Different behavior when calling XPathSelectElement on a null XElement between Mono 3.10 and .NET/MS-CLR 4.5

[d_k]

Hello,

I'm not sure how to call the none Mono CLR so i'll call it .NET 4.5.

I'm not sure how much of an issue is it really but I noticed that the
following code produces different results for me in Mono and in .NET:

Console.WriteLine("Start");
XElement element = null;
XElement result = element.XPathSelectElement("missing");
if (result != null)
{
    Console.WriteLine(result.Value);
}
Console.WriteLine("End.");

In .NET 4.5 this produces a System.ArgumentNullException as the argument
passed to the extension method XPathSelectElement is null.

In Mono 3.10 the call to XPathSelectElement returns null which then
continues execution and as a result code that runs fine on Mono throws on
Windows/.NET 4.5

If it helps I'm running Mono version 3.10.0 compiled from source on
slaware-current x86_64.

Is it really an issue or is so by design?
Should I open a bug for it and if so what should I include or is this
discrepancy should be tolerated?
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