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Error when running setup.py for various platforms

See original GitHub issue

Thanks so much to the developers of this project, I am absolutely loving working with this, just had a little hiccup. 😳

Using macOS Sierra, when I run python3 setup.py ios -s, or a setup for any other platform, I get the error as follows:

(venv) MacBookPro:beeccc liam$ python3 setup.py ios -s
running ios
 * Writing application template...
Project template: https://github.com/pybee/Python-iOS-template.git
Traceback (most recent call last):
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/vcs.py", line 129, in clone
    stderr=subprocess.STDOUT,
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 418, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['git', 'checkout', '3.6']' returned non-zero exit status 1.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "setup.py", line 79, in <module>
    'toga-django',
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/briefcase/app.py", line 336, in run
    self.generate_app_template()
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/briefcase/app.py", line 195, in generate_app_template
    'secret_key': self.secret_key,
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/main.py", line 63, in cookiecutter
    no_input=no_input,
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/repository.py", line 84, in determine_repo_dir
    no_input=no_input,
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/vcs.py", line 132, in clone
    if 'not found' in clone_error.output.lower():
TypeError: a bytes-like object is required, not 'str'

I suspect this is because git is failing to clone the cookiecutter for the selected platform. If this is the case, should it perhaps fail more gracefully?

When I try again running the setup.py for ios again I get this:

(venv) MacBookPro:beeccc liam$ python3 setup.py ios -s
running ios
 * Writing application template...
Template Python-iOS-template succesfully updated.
Project template: /Users/liam/.cookiecutters/Python-iOS-template
Traceback (most recent call last):
  File "setup.py", line 79, in <module>
    'toga-django',
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/briefcase/app.py", line 336, in run
    self.generate_app_template()
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/briefcase/app.py", line 195, in generate_app_template
    'secret_key': self.secret_key,
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/main.py", line 63, in cookiecutter
    no_input=no_input,
  File "/Users/liam/apps/beeccc/venv/lib/python3.6/site-packages/cookiecutter/repository.py", line 101, in determine_repo_dir
    '\n'.join(repository_candidates)
cookiecutter.exceptions.RepositoryNotFound: A valid repository for "/Users/liam/.cookiecutters/Python-iOS-template" could not be found in the following locations:

Should a check be conducted to ensure the cookiecutter template for the selected platform is correct and/or up to date?