Give generate_media_config optional return type

src/robot_interface/models/mission/task.py

@@ -1,6 +1,6 @@
 from dataclasses import dataclass, field
 from enum import Enum
-from typing import Iterator, Literal, Optional, Type, Union
+from typing import Literal, Optional, Type, Union
 
 from alitra import Pose, Position
 

src/robot_interface/robot_interface.py

@@ -1,7 +1,7 @@
 from abc import ABCMeta, abstractmethod
 from queue import Queue
 from threading import Thread
-from typing import Callable, List
+from typing import Callable, List, Optional
 
 from robot_interface.models.robots.media import MediaConfig
 from robot_interface.models.initialize import InitializeParams
@@ -226,7 +226,7 @@ def initialize(self, params: InitializeParams) -> None:
         raise NotImplementedError
 
     @abstractmethod
-    def generate_media_config(self) -> MediaConfig:
+    def generate_media_config(self) -> Optional[MediaConfig]:
         """
         Generate a JSON containing the url and token needed to establish a media stream
         connection to a robot.