fix mail-plugin

this fix load config the right way.
now you can install mail-plugin with
```flaschengeist plugin install mail && flaschengeist plugin enable mail```

flaschengeist/plugins/message_mail.py

@@ -1,6 +1,7 @@
 import smtplib
 from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
+from werkzeug.exceptions import InternalServerError
 
 from flaschengeist import logger
 from flaschengeist.models import User
@@ -8,23 +9,29 @@ from flaschengeist.plugins import Plugin
 from flaschengeist.utils.hook import HookAfter
 from flaschengeist.controller import userController
 from flaschengeist.controller.messageController import Message
+from flaschengeist.config import config
 
 
 class MailMessagePlugin(Plugin):
-    def __init__(self, entry_point, config):
-        super().__init__(entry_point, config)
-        self.server = config["SERVER"]
-        self.port = config["PORT"]
-        self.user = config["USER"]
-        self.password = config["PASSWORD"]
-        self.crypt = config["CRYPT"]
-        self.mail = config["MAIL"]
+    def load(self):
+        self.config = config.get("mail", None)
+        if self.config is None:
+            logger.error("mail was not configured in flaschengeist.toml")
+            raise InternalServerError
+        self.server = self.config["SERVER"]
+        self.port = self.config["PORT"]
+        self.user = self.config["USER"]
+        self.password = self.config["PASSWORD"]
+        self.crypt = self.config["CRYPT"]
+        self.mail = self.config["MAIL"]
 
         @HookAfter("send_message")
-        def dummy_send(msg):
+        def dummy_send(msg, *args, **kwargs):
+            logger.info(f"(dummy_send) Sending message to {msg.receiver}")
             self.send_mail(msg)
 
     def send_mail(self, msg: Message):
+        logger.debug(f"Sending mail to {msg.receiver}")
         if isinstance(msg.receiver, User):
             if not msg.receiver.mail:
                 logger.warning("Could not send Mail, mail missing: {}".format(msg.receiver))
@@ -34,8 +41,13 @@ class MailMessagePlugin(Plugin):
             recipients = userController.get_user_by_role(msg.receiver)
 
         mail = MIMEMultipart()
-        mail["From"] = self.mail
-        mail["To"] = ", ".join(recipients)
+        try:
+            mail["From"] = self.mail
+            mail["To"] = ", ".join(recipients)
+        except Exception as e:
+            import traceback
+
+            print(traceback.format_exc())
         mail["Subject"] = msg.subject
         mail.attach(MIMEText(msg.message))
         if not hasattr(self, "smtp"):