Produce a .hocr file that reports no text detected on a page that is
    the same size as the input image.

def _generate_null_hocr(output_hocr, output_sidecar, image):
    """Produce a .hocr file that reports no text detected on a page that is
    the same size as the input image."""
    from PIL import Image

    im = Image.open(image)
    w, h = im.size

    with open(output_hocr, 'w', encoding="utf-8") as f:
        f.write(HOCR_TEMPLATE.format(w, h))
    with open(output_sidecar, 'w', encoding='utf-8') as f:
        f.write('[skipped page]')