SVG export: fix failure on trying to read graphic of a 3D shape

Regression from commit 8fc1b60f62 (sw SVG
export: try to reuse original bitmap data for JPG and PNG bitmaps,
2020-02-27), which generalized the code that tries to get the original
bitmap of shapes for performance reasons. Originally this worked with
SdrGrafObj, but now we try every XShape which has a Graphic property.

Add the missing check, so shapes without a graphic property just miss
the fast path, but doesn't fail the entire SVG export.

Change-Id: I6b20083110f3269337b9df6a23bd193cc6f7d13b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102187
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

filter/qa/unit/svg.cxx

@@ -160,6 +160,25 @@ CPPUNIT_TEST_FIXTURE(SvgFilterTest, testSemiTransparentText)
     assertXPath(pXmlDoc, "//svg:text[2]/svg:tspan/svg:tspan/svg:tspan[@fill-opacity]", 0);
 }
 
+CPPUNIT_TEST_FIXTURE(SvgFilterTest, testShapeNographic)
+{
+    // Load a document containing a 3D shape.
+    load("shape-nographic.odp");
+
+    // Export to SVG.
+    uno::Reference<frame::XStorable> xStorable(getComponent(), uno::UNO_QUERY_THROW);
+    SvMemoryStream aStream;
+    uno::Reference<io::XOutputStream> xOut = new utl::OOutputStreamWrapper(aStream);
+    utl::MediaDescriptor aMediaDescriptor;
+    aMediaDescriptor["FilterName"] <<= OUString("impress_svg_Export");
+    aMediaDescriptor["OutputStream"] <<= xOut;
+
+    // Without the accompanying fix in place, this test would have failed with:
+    // An uncaught exception of type com.sun.star.io.IOException
+    // - SfxBaseModel::impl_store <private:stream> failed: 0xc10(Error Area:Io Class:Write Code:16)
+    xStorable->storeToURL("private:stream", aMediaDescriptor.getAsConstPropertyValueList());
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

filter/source/svg/svgexport.cxx

@@ -59,6 +59,7 @@
 #include <svx/svdograf.hxx>
 #include <svx/svdmodel.hxx>
 #include <svx/svdxcgv.hxx>
+#include <sal/log.hxx>
 
 #include <memory>
 
@@ -608,7 +609,7 @@ bool SVGFilter::implExportImpressOrDraw( const Reference< XOutputStream >& rxOSt
                 {
                     delete mpSVGDoc;
                     mpSVGDoc = nullptr;
-                    OSL_FAIL( "Exception caught" );
+                    SAL_WARN("filter.svg", "Exception caught");
                 }
 
                 if( nullptr != pSdrModel )

filter/source/svg/svgwriter.cxx

@@ -2758,7 +2758,10 @@ void GetGraphicFromXShape(const css::uno::Reference<css::drawing::XShape>* pShap
     }
 
     uno::Reference<graphic::XGraphic> xGraphic;
-    xPropertySet->getPropertyValue("Graphic") >>= xGraphic;
+    if (xPropertySet->getPropertySetInfo()->hasPropertyByName("Graphic"))
+    {
+        xPropertySet->getPropertyValue("Graphic") >>= xGraphic;
+    }
     rGraphic= Graphic(xGraphic);
 }
 }