Fix lookup of configuration options

When the type of an embedder was not specified in the config, it was added
automatically during embedder initialization. This prevented correct default
option lookup (because it ends as soon as a "type" field is found).

kge/model/kge_model.py

@@ -155,18 +155,12 @@ def __init__(self, config: Config, dataset: Dataset, configuration_key: str):
         #: location of the configuration options of this embedder
         self.configuration_key = configuration_key
         self.embedder_type = self.get_option("type")
-        if self.configuration_key + ".type" not in config.options:
-            self.config.set(
-                self.configuration_key + ".type",
-                self.embedder_type,
-                create=True,
-                log=True,
-            )
 
         # verify all custom options by trying to set them in a copy of this
         # configuration (quick and dirty, but works)
         custom_options = Config.flatten(config.get(self.configuration_key))
-        del custom_options["type"]
+        if "type" in custom_options:
+            del custom_options["type"]
         dummy_config = self.config.clone()
         for key, value in custom_options.items():
             try: