plugin: add forgotten signal_failure method

edmond/plugin.py

@@ -93,6 +93,10 @@ class Plugin:
                 content = " ".join(words[2:-1])
             return Command(ident, content)
 
+    def signal_failure(self, target):
+        """Signal a plugin failure to target."""
+        self.bot.say(target, self.bot.config["error_message"])
+
 
 @dataclass
 class Question:

edmond/plugins/journee_mondiale.py

@@ -21,13 +21,13 @@ class JourneeMondialePlugin(Plugin):
             return False
         response = http_get(self.config["url"])
         if not response:
-            self.signal_failure()
+            self.signal_failure(event.target)
             return True
         soup = BeautifulSoup(response, "html.parser")
         try:
             jm = soup.find("div", id="journeesDuJour").find("h2").string
         except (ValueError, KeyError):
-            self.signal_failure()
+            self.signal_failure(event.target)
             return True
         self.bot.say(event.target, jm)
         return True