Issue #199: Installation from repository source fails (conservancy/kallithea)

[Constantin Veretennicov]

New issue 199: Installation from repository source fails
https://bitbucket.org/conservancy/kallithea/issues/199/installation-from-repository-source-fails

Constantin Veretennicov:

I am installing from source on Ubuntu 15.10, according to http://docs.kallithea-scm.org/en/latest/installation.html#installation-from-repository-source

```python2 setup.py develop``` step fails in Mercurial setup:

```
Running mercurial-3.7.2/setup.py -q bdist_egg --dist-dir /tmp/easy_install-a_EOOe/mercurial-3.7.2/egg-dist-tmp-eMXa3f
Traceback (most recent call last):
  File "setup.py", line 190, in <module>
    """,
  File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/develop.py", line 34, in run
    self.install_for_development()
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/develop.py", line 133, in install_for_development
    self.process_distribution(None, self.dist, not self.no_deps)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 720, in process_distribution
    [requirement], self.local_index, self.easy_install
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 827, in resolve
    dist = best[req.key] = env.best_match(req, ws, installer)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1072, in best_match
    return self.obtain(req, installer)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1084, in obtain
    return installer(requirement)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 640, in easy_install
    return self.install_item(spec, dist.location, tmpdir, deps)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 670, in install_item
    dists = self.install_eggs(spec, download, tmpdir)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 853, in install_eggs
    return self.build_and_install(setup_script, setup_base)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1081, in build_and_install
    self.run_setup(setup_script, setup_base, args)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1067, in run_setup
    run_setup(setup_script, args)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 246, in run_setup
    raise
  File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 195, in setup_context
    yield
  File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 166, in save_modules
    saved_exc.resume()
  File "/home/kveretennicov/work/spam/kallithea-venv/local/lib/python2.7/site-packages/setuptools/sandbox.py", line 140, in resume
    type, exc = map(pickle.loads, self._saved)
  File "/usr/lib/python2.7/pickle.py", line 1382, in loads
    return Unpickler(file).load()
  File "/usr/lib/python2.7/pickle.py", line 858, in load
    dispatch[key](self)
  File "/usr/lib/python2.7/pickle.py", line 971, in load_string
    self.append(rep.decode("string-escape"))
  File "/home/kveretennicov/work/spam/kallithea-venv/lib/python2.7/encodings/__init__.py", line 100, in search_function
    level=0)
  File "/tmp/easy_install-a_EOOe/mercurial-3.7.2/mercurial/__init__.py", line 53, in find_module
TypeError: argument of type 'NoneType' is not iterable
```

Some info:

```
(kallithea-venv)kveretennicov at azelle:~/work/spam/kallithea$ hg id
941548131765 (stable) tip
(kallithea-venv)kveretennicov at azelle:~/work/spam/kallithea$ python2 --version
Python 2.7.10
```

I see the same on Windows with Python 2.7.11.

It succeeds if I ```hg up -r 0.3```.