crashtesting: a gadzillion failures on export to odp

e.g. fdo35235-1.odp

Change-Id: I259cdc9ed073be2ad7d5208cd943d4f193f09c16

xmloff/source/text/txtparae.cxx

@@ -1643,6 +1643,9 @@ void XMLTextParagraphExport::exportText(
         GetExport().GetShapeExport(); // make sure the graphics styles family
                                       // is added
     Reference < XEnumerationAccess > xEA( rText, UNO_QUERY );
+    if( ! xEA.is() )
+        return;
+
     Reference < XEnumeration > xParaEnum(xEA->createEnumeration());
     Reference < XPropertySet > xPropertySet( rText, UNO_QUERY );
     Reference < XTextSection > xBaseSection;