[pypy-issue] Issue #1889: AttributeError importing module (pypy/pypy)

[Anthony Sottile]

New issue 1889: AttributeError importing module
https://bitbucket.org/pypy/pypy/issue/1889/attributeerror-importing-module

Anthony Sottile:

```
$ virtualenv venv -p pypy3
Running virtualenv with interpreter /home/asottile/bin/pypy3
New pypy executable in venv/bin/pypy3
Also creating executable in venv/bin/pypy
Installing setuptools, pip...done.
$ source venv/bin/activate
(venv)$ pip install jsonschema
Downloading/unpacking jsonschema
  Using download cache from /home/asottile/.pip/cache/https%3A%2F%2Fpypi.python.org%2Fpackages%2F2.7%2Fj%2Fjsonschema%2Fjsonschema-2.4.0-py2.py3-none-any.whl
Installing collected packages: jsonschema
Successfully installed jsonschema
Cleaning up...
(venv)asottile at work:~/workspace/pre-commit$ pypy -c 'import jsonschema'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/asottile/workspace/pre-commit/venv/site-packages/jsonschema/__init__.py", line 18, in <module>
    from jsonschema.validators import (
  File "/home/asottile/workspace/pre-commit/venv/site-packages/jsonschema/validators.py", line 157, in <module>
    meta_schema=_utils.load_schema("draft3"),
  File "/home/asottile/workspace/pre-commit/venv/site-packages/jsonschema/_utils.py", line 57, in load_schema
    data = pkgutil.get_data(__package__, "schemas/{0}.json".format(name))
  File "/home/asottile/packages/pypy3-2.3.1-linux64/lib-python/3/pkgutil.py", line 573, in get_data
    loader = get_loader(package)
  File "/home/asottile/packages/pypy3-2.3.1-linux64/lib-python/3/pkgutil.py", line 461, in get_loader
    return find_loader(fullname)
  File "/home/asottile/packages/pypy3-2.3.1-linux64/lib-python/3/pkgutil.py", line 471, in find_loader
    for importer in iter_importers(fullname):
  File "/home/asottile/packages/pypy3-2.3.1-linux64/lib-python/3/pkgutil.py", line 421, in iter_importers
    if fullname.startswith('.'):
AttributeError: 'NoneType' object has no attribute 'startswith'
(venv)$ pypy --version
Python 3.2.5 (986752d005bb, Jun 19 2014, 16:18:53)
[PyPy 2.3.1 with GCC 4.6.3]
(venv)$ pip freeze -l
jsonschema==2.4.0
(venv)$ pip freeze
cffi==0.8
greenlet==0.4.0
jsonschema==2.4.0
readline==6.2.4.1
wsgiref==0.1.2
```