added support for blank web pages

Author: nataliakoval

src/webdriver/extension_qt/web_view_util.cc

@@ -36,6 +36,11 @@ bool QWebViewUtil::isUrlSupported(QWebPage* pWebPage, const std::string& url, Er
 }	
 
 bool QWebViewUtil::isUrlSupported(const std::string& url, Error **error) {
+    // support blank page
+    const std::string BLANK = "about:blank";
+    if (!url.compare(BLANK))
+        return true;
+
     scoped_ptr<QNetworkAccessManager> pmanager(new QNetworkAccessManager());
     scoped_ptr<QContentTypeResolver> presolver(new QContentTypeResolver(pmanager.get()));