Description of problem:

When attempting to 'rbt post' inside a repository created with 'git svn clone', posting fails and "CRITICAL: object of type 'NoneType' has no len()." is displayed.  More detail is given 

Version-Release number of selected component (if applicable):

  NA

How reproducible:

  Always

Steps to Reproduce:
1. git svn clone a repository that is linked to an RB instance
2. rbt post in the new clone

Actual results:

  CRITICAL: object of type 'NoneType' has no len().

Expected results:

  Successful RB posting.

Additional info:

  Running 'rbt post --debug' produces:

>>> RBTools 0.7.2
>>> Python 2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]
>>> Running on
Linux-2.6.32-504.12.2.el6.x86_64-x86_64-with-centos-6.6-Final
>>> Home = /home/cstapleton
>>> Current directory = /home/cstapleton/public_html/2768_CS_MORENEWS/local/interface/ATECentral2
>>> Checking for a Subversion repository...
>>> Running: svn info --non-interactive
>>> Command exited with rc 1: ['svn', 'info', '--non-interactive']
svn: '.' is not a working copy
---
>>> Checking for a Git repository...
>>> Running: git rev-parse --git-dir
>>> Running: git config core.bare
>>> Running: git rev-parse --show-toplevel
>>> Running: git symbolic-ref -q HEAD
>>> Running: git svn info
>>> Running: git svn rebase -n
>>> repository info: Path: file:///home/svnroot, Base path:
/trunk/AMSER2, Supports changesets: False
>>> Making HTTP GET request to https://int.scout.wisc.edu/reviewboard/api/
>>> Making HTTP GET request to
https://int.scout.wisc.edu/reviewboard/api/repositories/
>>> Cached response for HTTP GET
https://int.scout.wisc.edu/reviewboard/api/repositories/ expired and
was modified
>>> Making HTTP GET request to
https://int.scout.wisc.edu/reviewboard/api/repositories/1/info/
>>> Cached response for HTTP GET
https://int.scout.wisc.edu/reviewboard/api/repositories/1/info/
expired and was modified
>>> repository info: Path: file:///home/svnroot, Base path:
/trunk/AMSER2, Supports changesets: False
>>> Running: git rev-parse refs/heads/master
>>> Running: git merge-base 727c08c23a00a1b209f4b1bdd862ced721b21e20
refs/remotes/git-svn
>>> Running: git rev-parse 197babf39f7dcf9e880fdc8a559664f6691d6e65
>>> Running: git status --porcelain --untracked-files=no
>>> Running: git rev-parse --git-dir
>>> Running: git -c core.quotepath=false diff --no-color --no-prefix
-r -u --no-ext-diff 197babf39f7dcf9e880fdc8a559664f6691d6e65..727c08c23a00a1b209f4b1bdd862ced721b21e20
>>> Command exited with rc 129: ['git', '-c', 'core.quotepath=false',
'diff', '--no-color', '--no-prefix', '-r', '-u', '--no-ext-diff', u'197babf39f7dcf9e880fdc8a559664f6691d6e65..727c08c23a00a1b209f4b1bdd862ced721b21e20']
[]---
Traceback (most recent call last):
  File "/usr/bin/rbt", line 9, in <module>
    load_entry_point('RBTools==0.7.2', 'console_scripts', 'rbt')()
  File "/usr/lib/python2.6/site-packages/rbtools/commands/main.py",
line 133, in main
    command.run_from_argv([RB_MAIN, command_name] + args)
  File
"/usr/lib/python2.6/site-packages/rbtools/commands/__init__.py", line
555, in run_from_argv
    exit_code = self.main(*args) or 0
  File "/usr/lib/python2.6/site-packages/rbtools/commands/post.py",
line 639, in main
    extra_args=extra_args)
  File "/usr/lib/python2.6/site-packages/rbtools/clients/git.py", line
448, in diff
    exclude_patterns)
  File "/usr/lib/python2.6/site-packages/rbtools/clients/git.py", line
552, in make_diff
    results_unicode=False)
  File "/usr/lib/python2.6/site-packages/rbtools/utils/process.py",
line 102, in execute
    if split_lines and len(data) > 0:
TypeError: object of type 'NoneType' has no len()

Manually running
git -c core.quotepath=false diff --no-color --no-prefix
-r -u --no-ext-diff 197babf39f7dcf9e880fdc8a559664f6691d6e65..727c08c23a00a1b209f4b1bdd862ced721b21e20

Produces:
Unknown option: -c
usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path]
           [-p|--paginate|--no-pager] [--no-replace-objects]
           [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]
           [--help] COMMAND [ARGS]

The installed git is:

azure:~$ git --version
git version 1.7.1
azure:~$ yum info git
Loaded plugins: changelog, etckeeper, fastestmirror, security
Loading mirror speeds from cached hostfile
 * base: bay.uchicago.edu
 * elrepo: mirror.symnds.com
 * epel: mirror.steadfast.net
 * extras: mirrors.tripadvisor.com
 * updates: mirror.nexcess.net
Installed Packages
Name        : git
Arch        : x86_64
Version     : 1.7.1
Release     : 3.el6_4.1
Size        : 15 M
Repo        : installed
From repo   : updates
Summary     : Fast Version Control System
URL         : http://git-scm.com/
License     : GPLv2
Description : Git is a fast, scalable, distributed revision control system with an
            : unusually rich command set that provides both high-level operations
            : and full access to internals.
            :
            : The git rpm installs the core tools with minimal dependencies.  To
            : install all git packages, including tools for integrating with other
            : SCMs, install the git-all meta-package.


From the git release notes, it looks as though the '-c name=value' option was introduced with git 1.7.2 ?


Changing line 477 of /usr/lib/python2.6/site-packages/rbtools/clients/git.py from
  git_cmd = [self.git, '-c', 'core.quotepath=false'] 
to
  git_cmd = [self.git]

resolves the issue.