Imagedata test: test fill-attributes are not written at all

Change-Id: Iac7e3a14753ee0e0c6d64bda270043462fa3f20a
Reviewed-on: https://gerrit.libreoffice.org/15698Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Joren De Cuyper <jorendc@libreoffice.org>

sw/qa/extras/ooxmlexport/ooxmlexport2.cxx

@@ -1115,8 +1115,8 @@ DECLARE_OOXMLEXPORT_TEST(NoFillAttrInImagedata, "NoFillAttrInImagedata.docx")
     if (!pXmlDoc)
         return;
 
-    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/mc:AlternateContent[2]/mc:Fallback/w:pict/v:rect/v:imagedata", "type", "");
-    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:r/mc:AlternateContent[2]/mc:Fallback/w:pict/v:rect/v:imagedata", "color2", "");
+    assertXPathNoAttribute(pXmlDoc, "/w:document/w:body/w:p/w:r/mc:AlternateContent[2]/mc:Fallback/w:pict/v:rect/v:imagedata", "type");
+    assertXPathNoAttribute(pXmlDoc, "/w:document/w:body/w:p/w:r/mc:AlternateContent[2]/mc:Fallback/w:pict/v:rect/v:imagedata", "color2");
 }
 
 DECLARE_OOXMLEXPORT_TEST(testBnc837302, "bnc837302.docx")