Inference configuration is not optional

Author: tisnik

src/configuration.py

@@ -106,7 +106,7 @@ def customization(self) -> Optional[Customization]:
         return self._configuration.customization
 
     @property
-    def inference(self) -> Optional[InferenceConfiguration]:
+    def inference(self) -> InferenceConfiguration:
         """Return inference configuration."""
         assert (
             self._configuration is not None

src/models/config.py

@@ -249,7 +249,7 @@ class Configuration(BaseModel):
         AuthenticationConfiguration()
     )
     customization: Optional[Customization] = None
-    inference: Optional[InferenceConfiguration] = InferenceConfiguration()
+    inference: InferenceConfiguration = InferenceConfiguration()
 
     def dump(self, filename: str = "configuration.json") -> None:
         """Dump actual configuration into JSON file."""