this assert is wrong

In calc it seems that shapes can have no autostyle.
e.g. exporting fdo60469-74405.xlsx to ods

Change-Id: Ie0b2888094ba40a89748a070ca2d14f4078da619
diff --git a/xmloff/source/text/txtparae.cxx b/xmloff/source/text/txtparae.cxx
index 32ff3ad..8ee117d 100644
--- a/xmloff/source/text/txtparae.cxx
+++ b/xmloff/source/text/txtparae.cxx
@@ -794,7 +794,7 @@ OUString XMLTextParagraphExport::FindTextStyleAndHyperlink(
        }
        OUString sParent; // AutoStyles should not have parents!
        sName = GetAutoStylePool().Find( XML_STYLE_FAMILY_TEXT_TEXT, sParent, xPropStates );
        assert(!sName.isEmpty()); // AutoStyle could not be found
        // assert(!sName.isEmpty()); // AutoStyle could not be found
        rbHasAutoStyle = sal_True;
    }