refactor(cameras): width, fps and height is mandatory to have a value in robot config

lerobot/common/robots/config.py

@@ -12,6 +12,17 @@ class RobotConfig(draccus.ChoiceRegistry, abc.ABC):
     # Directory to store calibration file
     calibration_dir: Path | None = None
 
+    def __post_init__(self):
+        if hasattr(self, "cameras"):
+            cameras = self.cameras
+            if cameras:
+                for cam_name, cam_config in cameras.items():
+                    for attr in ["width", "height", "fps"]:
+                        if getattr(cam_config, attr) is None:
+                            raise ValueError(
+                                f"Camera config for '{cam_name}' has None value for required attribute '{attr}'"
+                            )
+
     @property
     def type(self) -> str:
         return self.get_choice_name(self.__class__)

tests/cameras/test_opencv.py

@@ -28,6 +28,8 @@ from lerobot.common.cameras.configs import Cv2Rotation
 from lerobot.common.cameras.opencv import OpenCVCamera, OpenCVCameraConfig
 from lerobot.common.errors import DeviceAlreadyConnectedError, DeviceNotConnectedError
 
+# NOTE(Steven): Consider improving the assert coverage
+
 
 def test_base_class_implementation():
     config = OpenCVCameraConfig(index_or_path=0)