Treat empty variants as null ones in wxMSW OLE code.

Simply ignoring VT_EMPTY variants doesn't make any sense and can result in
completely unexpected results, so don't do it.

Closes #15757.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75396 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/ole/oleutils.cpp

@@ -545,12 +545,10 @@ wxConvertOleToVariant(const VARIANTARG& oleVariant, wxVariant& variant, long fla
                 break;
 
             case VT_NULL:
+            case VT_EMPTY:
                 variant.MakeNull();
                 break;
 
-            case VT_EMPTY:
-                break;    // Ignore Empty Variant, used only during destruction of objects
-
             default:
                 wxLogError(wxT("wxAutomationObject::ConvertOleToVariant: Unknown variant value type %X -> %X"),
                            oleVariant.vt,oleVariant.vt&VT_TYPEMASK);