tdf#59323: ooxml import: hasShapeStyleRefs

Helper function to determine whether the shape has style refs or not.

Change-Id: I57b244b4af5b9e3abba90f0e4e25a35da27e3409
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/117002
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
diff --git a/include/oox/drawingml/shape.hxx b/include/oox/drawingml/shape.hxx
index 53401d1..1abc9c0 100644
--- a/include/oox/drawingml/shape.hxx
+++ b/include/oox/drawingml/shape.hxx
@@ -179,6 +179,7 @@ public:
    ShapeStyleRefMap&        getShapeStyleRefs() { return maShapeStyleRefs; }
    const ShapeStyleRefMap&  getShapeStyleRefs() const { return maShapeStyleRefs; }
    const ShapeStyleRef*            getShapeStyleRef( sal_Int32 nRefType ) const;
    bool hasShapeStyleRefs() const { return !maShapeStyleRefs.empty(); }

    // addShape is creating and inserting the corresponding XShape.
    void                addShape(