avoid exception

Transformation is an optional property of XShape,
rATransformation can refer to an empty Any.

results in warnings like this, e.g. when you add a legend:
> warn:chart2:27587:1:chart2/source/view/main/ShapeFactory.cxx:2135:
> Exception caught. Type: N3com3sun4star3uno9ExceptionE, Message:

set Transformation property only if needed

Change-Id: I1edae0a984f8264a6a0638b90a7197e316832c02
Reviewed-on: https://gerrit.libreoffice.org/29527Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

chart2/source/view/main/ShapeFactory.cxx

@@ -2225,15 +2225,18 @@ uno::Reference< drawing::XShape >
         //set whole text shape properties
         PropertyMapper::setMultiProperties( rPropNames, rPropValues, xProp );
 
-        //set position matrix
-        //the matrix needs to be set at the end behind autogrow and such position influencing properties
-        try
-        {
-            xProp->setPropertyValue( "Transformation", rATransformation );
-        }
-        catch( const uno::Exception& e )
+        if (rATransformation.hasValue())
         {
-            ASSERT_EXCEPTION( e );
+            //set position matrix
+            //the matrix needs to be set at the end behind autogrow and such position influencing properties
+            try
+            {
+                xProp->setPropertyValue( "Transformation", rATransformation );
+            }
+            catch( const uno::Exception& e )
+            {
+                ASSERT_EXCEPTION( e );
+            }
         }
     }
     return xShape;