AgentDataset with rasterizer set to None

[ahmed-h-elsheikh]

Code crashes when rasterizer is set to None as a special case for handling data["image"]=None is missing in line 84 ego.py --> see specific error below

l5kit/dataset/ego.py in get_frame(self, scene_index, state_index, track_id)
     82         data = self.sample_function(state_index, frames, self.dataset.agents, self.dataset.tl_faces, track_id)
     83         # 0,1,C -> C,0,1
---> 84         image = data["image"].transpose(2, 0, 1)

[lucabergamini]

Hey @ahmed-h-elsheikh are you on master or some released version?
We have an option (stub_debug) you can use into build_rasterizer to get an empty tensor each time.

[lucabergamini]

stub_debug is now available also in the latest release. I'll close this one for now