fix issue with adding title to any page

in hindsight that was kind of obvious...

src/text.py

@@ -100,7 +100,7 @@ def doctree_from_url(url, elem_class='div', class_name='article-body'):
     article = extract_article(url)
     # convert to MD to handle splitting better
     article_content = select_content(article.html, elem_class, class_name)
-    requires_title = not any(filter(lambda x: x.strip().startswith('# '), article_content.split('\n')))
+    requires_title = list(filter(lambda x: x.strip().startswith('# '), article_content.split('\n'))) != []
 
     if requires_title:
         print('Didn\'t find title, will add it manually...')