add etherpad-check to clean method

fet2020/intern/models.py

@@ -164,10 +164,11 @@ class Etherpad(models.Model):
                 params={"length": len(pad_name), "pad_name": pad_name},
             )
 
-    def save(self, *args, **kwargs):
+        self.etherpad_key = create_pad(pad_name)
-        self.etherpad_key = create_pad(self.__get_pad_name())
+        if not self.etherpad_key:
-
+            raise ValidationError(
-        super().save(*args, **kwargs)
+                _(f"Etherpad '{pad_name}' konnte nicht erstellt werden."),
+            )
 
     def __str__(self):
         return self.title