Zelenium: catch errors when dumping DOM

This can happen with cross origin document, when using open on another
domain. In that case selenium crashes and the test never finishes, this
allows selenium to finish and report the error.

product/Zelenium/selenium/core/scripts/selenium-testrunner.js

@@ -553,7 +553,11 @@ objectExtend(HtmlTestCaseRow.prototype, {
             )
             return convertDocumentToDataUrl(doc);
           }
+          try {
             aElement.href = recursiveConvertIframeToDataUrl(sel$('selenium_myiframe').contentWindow.document);
+          } catch (e) {
+            console.warn("Ignored error while dumping document");
+          }
           this.trElement.cells[2].appendChild(aElement);
         }
     },