No text placed returns just empty list

[andreybondarb]

line 54 in gen.py returns just an empty list. Meaning no text is placed on image. What can be done here?

res = RV3.render_text(img, depth, seg, area, label, ninstance=args.instance_per_image, viz=False)

(https://github.com/PkuDavidGuan/CurvedSynthText/blob/d411ea28c8578d78397641fed30cf43929787e7f/gen.py#L54)