Only select the first radio button if there is one in wxMSW wxRadioBox.

Don't call SetSelection(0) if the radio box is empty.

See #16630.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78043 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/radiobox.cpp

@@ -245,7 +245,9 @@ bool wxRadioBox::Create(wxWindow *parent,
 #endif
 
     SetMajorDim(majorDim == 0 ? n : majorDim, style);
-    SetSelection(0);
+    // Select the first radio button if we have any buttons at all.
+    if ( n > 0 )
+        SetSelection(0);
     SetSize(pos.x, pos.y, size.x, size.y);
 
     // Now that we have items determine what is the best size and set it.