ofz#14422 null deref

Change-Id: Icd00e2aaa5932564668cd12ce4ee63aecc34419a
Reviewed-on: https://gerrit.libreoffice.org/71226
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

oox/source/drawingml/diagram/diagramlayoutatoms.cxx

@@ -1290,6 +1290,12 @@ bool LayoutNode::setupShape( const ShapePtr& rShape, const dgm::Point* pPresNode
                 continue;
             }
 
+            if (!aDataNode2->second->mpShape)
+            {
+                //busted, skip it
+                continue;
+            }
+
             rShape->setDataNodeType(aDataNode2->second->mnType);
 
             if (rItem.mnDepth == 0)