handle one more place with MSO 2007 vs OOXML spec for charts

Change-Id: I7dbc3017f2bba7b186174be2e4fd8c9ce7005d34

oox/source/drawingml/chart/chartspacefragment.cxx

@@ -91,8 +91,12 @@ ContextHandlerRef ChartSpaceFragment::onCreateContext( sal_Int32 nElement, const
                 case C_TOKEN( backWall ):
                     return new WallFloorContext( *this, mrModel.mxBackWall.create() );
                 case C_TOKEN( dispBlanksAs ):
-                    mrModel.mnDispBlanksAs = rAttribs.getToken( XML_val, XML_zero );
+                {
+                    bool bMSO2007Document = getFilter().isMSO2007Document();
+                    // default value is XML_gap for MSO 2007 and XML_zero in OOXML
+                    mrModel.mnDispBlanksAs = rAttribs.getToken( XML_val, bMSO2007Document ? XML_gap : XML_zero );
                     return 0;
+                }
                 case C_TOKEN( floor ):
                     return new WallFloorContext( *this, mrModel.mxFloor.create() );
                 case C_TOKEN( legend ):

oox/source/drawingml/chart/chartspacemodel.cxx

@@ -25,7 +25,7 @@ namespace drawingml {
 namespace chart {
 
 ChartSpaceModel::ChartSpaceModel(bool bMSO2007Doc) :
-    mnDispBlanksAs( XML_gap ),  // not zero as specified, TODO: OOXML_spec
+    mnDispBlanksAs( bMSO2007Doc ? XML_gap : XML_zero ),  // difference between OOXML spec and MSO 2007
     mnStyle( 2 ),
     mbAutoTitleDel( !bMSO2007Doc ), // difference between OOXML spec and MSO 2007
     mbPlotVisOnly( false ),