don't import data labels border properties for noFill borders

They are not shown anyway and just confuse us internally as they contain
a width but no color and produce invalid documents during export.

Change-Id: Ibe20a27b0172ece86dbb1f734df567b903465ebf

oox/source/drawingml/chart/seriesconverter.cxx

@@ -168,6 +168,10 @@ void lclConvertLabelFormatting( PropertySet& rPropSet, ObjectFormatter& rFormatt
 void importBorderProperties( PropertySet& rPropSet, Shape& rShape, const GraphicHelper& rGraphicHelper )
 {
     LineProperties& rLP = rShape.getLineProperties();
+    // no fill has the same effect as no border so skip it
+    if (rLP.maLineFill.moFillType.get() == XML_noFill)
+        return;
+
     if (rLP.moLineWidth.has())
     {
         sal_Int32 nWidth = convertEmuToHmm(rLP.moLineWidth.get());