Warnings/Errors crash due to undefined _print function

[adammw]

$ git commit
fatal: No names found, cannot describe anything.
Traceback (most recent call last):
  File ".git/hooks/pre-commit", line 140, in <module>
    ver = get_version()
  File ".git/hooks/pre-commit", line 55, in get_version
    ver = get_git_version()
  File ".git/hooks/pre-commit", line 28, in get_git_version
    _print('WARNING: git describe failed with: %s %s' % (n, result))
NameError: global name '_print' is not defined