Show setting description if no article exists

Turns out that italics can't be shown though. Too bad, so it won't be easy to see any more whether or not an article exists...

CuraSettingsGuide.py

@@ -136,7 +136,10 @@ def _getArticle(self, article_id) -> List[List[str]]:
 				with open(markdown_file, encoding="utf-8") as f:
 					markdown_str = f.read()
 			except OSError: #File doesn't exist or is otherwise not readable.
-				markdown_str = "There is no article on this topic."
+				if article_id in self._container_stack.getAllKeys():
+					markdown_str = self._container_stack.getProperty(article_id, "description") #Use the setting description as fallback.
+				else:
+					markdown_str = "There is no article on this topic."
 
 			images_path = os.path.join(os.path.dirname(__file__), "resources", "articles")
 			find_images = re.compile(r"!\[(.*)\]\((.+)\)")