Print traceback before calling warn()
Print traceback before calling warn()

Depending on warnings setup, warnings.warn() might raise, so the next
line might not be reached.

JosuaKrause/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip