search: skip pages that do not have any title

publish.py

@@ -97,6 +97,8 @@ def publish_mallard(module, branch, directory):
         text = open(page_file).read()
         text = re.sub('<title.*type="sort".*</title>', '', text)
         titles = re.findall('<title.*>(.*)<\/title>', text)
+        if not titles:
+            continue
         pages.append({
             'id': os.path.basename(page_file).rsplit('.', 1)[0],
             'title': remove_tags(titles[0]),