Replaced a NullReferedeException that was lost in the interop layer w… #12528
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Replaced a NullReferenceException (that was lost in the interop layer) with an HRESULT error code recommended in the docs - https://learn.microsoft.com/windows/win32/api/objidl/nf-objidl-idataobject-getdatahere#return-value. The HRESULT is not bubbled up through OleFlushClipboard either, this API returns S_OK even when the data wasn't set. In this case we end up with format being set successfully, but data is actually missing.
Modified a unit test to reflect the state of the Clipboard and to clear it afterwards.
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