Check if the calendar url link is "hidden"

For some reason they decided to hide old links instead of removing them, but the bot doesn't know the difference so it would never pick up the new calendar url.
Sometimes i think that they are fucking with us.

telegramschoolbot/tasks.py

@@ -99,6 +99,13 @@ def query_calendar_article(self, url):
                not lower_href.startswith("/weborario"):
                 continue
 
+            # For some reason they decided to hide old links
+            # instead of removing them, but the bot doesn't know the difference
+            # so it would never pick up the new calendar url
+            # Sometimes i think that they are fucking with us.
+            if len(link.getText()) < 3:
+                continue
+
             calendar_url = urllib.parse.urljoin(url, href)
             return calendar_url