when keypoints.detectPoints return [] it will cause some error

[tuantuanyyyy]

hi，when keypoints.detectPoints return []

fall-detection/utils.py

Line 465 in d5c5d3b

current_keypoints = self.keypoints.detectPoints(

it will cause some error.

 vector1_pairs = np.array(
                    previous_keypoints[self.vector_indices][self.pair_indices]
                )

I would like to ask, does the code not take into account the situation where no key points are detected when processing frames? If not, what logic should I consider when I modify it?

thank you!