Return from DoDrawSpline without doing anything (like segfaulting

<wink!>) if the list is empty.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30106 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dcbase.cpp

@@ -316,6 +316,10 @@ void wxDCBase::DoDrawSpline( wxList *points )
     double           x1, y1, x2, y2;
 
     wxList::compatibility_iterator node = points->GetFirst();
+    if (node == NULL)
+        // empty list
+        return;
+    
     p = (wxPoint *)node->GetData();
 
     x1 = p->x;