crashtesting: div-by-zero on load of tdf48948-2.pptx

Change-Id: Id05f65543eeb06526535ce9eaee354b4789e2069
Reviewed-on: https://gerrit.libreoffice.org/72883
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

oox/source/drawingml/diagram/diagramlayoutatoms.cxx

@@ -684,6 +684,8 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
             }
 
             const sal_Int32 nShapes = aCycleChildren.size();
+            if (nShapes)
+            {
                 const sal_Int32 nConnectorRadius = nRadius * cos(basegfx::deg2rad(nSpanAngle / nShapes));
                 const sal_Int32 nConnectorAngle = nSpanAngle > 0 ? 0 : 180;
 
@@ -716,6 +718,7 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
 
                     idx++;
                 }
+            }
             break;
         }