[Reproducible-builds] Bug#781280: --text crashes when encountering empty files

[Helmut Grohne]

Package: debbindiff
Version: 11
Tags: patch
User: helmutg at debian.org
Usertags: rebootstrap

debbindiff --text crashes when it encounters an empty file.

Example input package triggering the error: libreadline6

Example traceback being fixed:

Traceback (most recent call last):
  File "/usr/bin/debbindiff", line 120, in <module>
    sys.exit(main())
  File "/usr/bin/debbindiff", line 114, in main
    output_text(differences, print_func=print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 71, in output_text
    print_details(difference, print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 62, in print_details
    print_details(detail, new_print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 62, in print_details
    print_details(detail, new_print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 62, in print_details
    print_details(detail, new_print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 59, in print_details
    print_difference(detail, print_func)
  File "/usr/lib/python2.7/dist-packages/debbindiff/presenters/text.py", line 36, in print_difference
    if not difference.lines2[-1].endswith('\n'):
IndexError: list index out of range

I think the fix is pretty straight forward.

Helmut
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