bug: Stopping the first launch of openset.launch.py causes model loading failure in subsequent launches

[maciejmajek]

Describe the bug
Stopping the first launch of openset.launch.py causes model laoding failure in subsequent launches due to existing (corrupted) model files.

Relevant code

rai/src/rai_extensions/rai_open_set_vision/rai_open_set_vision/services/grounded_sam.py

Lines 42 to 50 in 9564f4f

	try:
	weight_path = self.get_parameter("weights_path").value
	assert isinstance(weight_path, str)
	if self.get_parameter("weights_path").value == "":
	weight_path = self._init_weight_path()
	self.segmenter = GDSegmenter(weight_path)
	except Exception:
	self.get_logger().error("Could not load model")
	raise Exception("Could not load model")

To Reproduce
Steps to reproduce the behavior:
setup RAI

1. run timeout 10 ros2 launch rai_bringup openset.launch.py to simulate ctrl+c during initialization
2. run ros2 launch rai_bringup openset.launch.py
3. See error

Expected behavior
Should either redownload the files or instruct the user to remove existing corrupted files

Screenshots
N/A

Platform

• OS: Ubuntu 24.04
• ROS 2 Version: Jazzy