在對人臉識別中進行影像處理時，運用的np.vstack()函式。使得如果攝像頭中沒有檢測到人臉就會報錯：ValueError: need at least one array to concatenate，有沒有好的解決辦法？
代碼如下：
bounding_boxes = []
for s in scales: # run P-Net on different scales
boxes = run_first_stage(image, pnet, scale=s, threshold=thresholds[0])
bounding_boxes.append(boxes)
# collect boxes (and offsets, and scores) from different scales
bounding_boxes = [i for i in bounding_boxes if i is not None]
bounding_boxes = np.vstack(bounding_boxes)
keep = nms(bounding_boxes[:, 0:5], nms_thresholds[0])
bounding_boxes = bounding_boxes[keep]
bounding_boxes = calibrate_box(bounding_boxes[:, 0:5],
bounding_boxes[:, 5:])
bounding_boxes = convert_to_square(bounding_boxes)
bounding_boxes[:, 0:4] = np.round(bounding_boxes[:, 0:4])
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