pootle CLI fails on new projects created from UI

[zgypa]

After adding a new projects, any pootle command to that project fails with
pootle_fs.exceptions.FSFetchError: Error: Source directory does not exist.. A closer look reveals that there is no folder in the translations working path, and by manually adding the directory, the CLI tools seem to function.

Steps to reproduce:

1. Admin > Projects > Add Project
2. From CLI, execute a pootle fs fetch testproj and observe.

Results (Expected/Actual):

Actual

Traceback (most recent call last):
  File "/home/pootle/pootle/env/bin/pootle", line 11, in <module>
    sys.exit(main())
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/pootle/runner.py", line 365, in main
    run_app(project='pootle', django_settings_module='pootle.settings')
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/pootle/runner.py", line 346, in run_app
    management.execute_from_command_line(command)
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/pootle/core/management/subcommands.py", line 164, in run_from_argv
    return self.subcommands[known.subcommand]().run_from_argv(argv)
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/django/core/management/base.py", line 345, in execute
    output = self.handle(*args, **options)
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/pootle/apps/pootle_fs/management/commands/fs_commands/fetch.py", line 16, in handle
    self.get_fs(options["project"]).fetch()
  File "/home/pootle/pootle/env/local/lib/python2.7/site-packages/pootle/apps/pootle_fs/localfs.py", line 51, in fetch
    raise FSFetchError(e)
pootle_fs.exceptions.FSFetchError: Error: Source directory does not exist.

Expected

CLI tools expected to work properly with a newly created project.

Environment (i.e. 'pootle --version', DB, OS, Browser):

• Pootle 2.9.0rc1 (Django 1.10.8, Translate Toolkit 2.2.5)
• (PostgreSQL) 9.5.10
• Ubuntu 16.04.3 LTS

[zgypa]

This issue might be related to #6766 and #6765.