When I try this on a directory without any config, and either prompt_toolkit 2.0.9 or 2.0.10 with questionary 1.4.0, I get an error

[jvorcak]

When I try this on a directory without any config, and either prompt_toolkit 2.0.9 or 2.0.10 with questionary 1.4.0, I get an error

> PYTHONPATH=~/projects/python/license.sh python3 ~/projects/python/license.sh/license-sh config
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/cache.py", line 34, in get
    return self._data[key]
KeyError: 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/jayvdb/projects/python/license.sh/license-sh", line 72, in <module>
    config_cmd(path, config)
  File "/home/jayvdb/projects/python/license.sh/license_sh/commands/__init__.py", line 69, in config_cmd
    answers = questionary.prompt(questions)
  File "/usr/lib/python3.7/site-packages/questionary/prompt.py", line 97, in prompt
    answer = question.unsafe_ask(patch_stdout)
  File "/usr/lib/python3.7/site-packages/questionary/question.py", line 59, in unsafe_ask
    return self.application.run()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 709, in run
    return run()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 683, in run
    return f.result()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/eventloop/future.py", line 149, in result
    raise self._exception
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/eventloop/coroutine.py", line 90, in step_next
    new_f = coroutine.throw(exc)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 658, in _run_async2
    result = yield f
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/eventloop/coroutine.py", line 86, in step_next
    new_f = coroutine.send(None)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 601, in _run_async
    self._redraw()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 444, in _redraw
    self.renderer.render(self, self.layout)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/renderer.py", line 546, in render
    layout.container.preferred_height(size.columns, size.rows).preferred)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 245, in preferred_height
    for c in self._all_children]
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 245, in <listcomp>
    for c in self._all_children]
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 2179, in preferred_height
    return self.content.preferred_height(width, max_available_height)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 1362, in preferred_height
    dont_extend=self.dont_extend_height())
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 1380, in _merge_dimensions
    preferred = get_preferred()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/containers.py", line 1357, in preferred_content_height
    self.get_line_prefix)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/controls.py", line 308, in preferred_height
    content = self.create_content(width, None)
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/controls.py", line 313, in create_content
    fragments_with_mouse_handlers = self._get_formatted_text_cached()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/controls.py", line 296, in _get_formatted_text_cached
    lambda: to_formatted_text(self.text, self.style))
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/cache.py", line 37, in get
    value = getter_func()
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/layout/controls.py", line 296, in <lambda>
    lambda: to_formatted_text(self.text, self.style))
  File "/usr/lib/python3.7/site-packages/prompt_toolkit/formatted_text/base.py", line 45, in to_formatted_text
    return to_formatted_text(value(), style=style)
  File "/usr/lib/python3.7/site-packages/questionary/prompts/common.py", line 306, in _get_choice_tokens
    tokens.pop()  # Remove last newline.
IndexError: pop from empty list

Note I get a different error if no args are given

> PYTHONPATH=~/projects/python/license.sh python3 ~/projects/python/license.sh/license-sh
Traceback (most recent call last):
  File "/home/jayvdb/projects/python/license.sh/license-sh", line 102, in <module>
    dep_tree, WHITELIST
  File "/home/jayvdb/projects/python/license.sh/license-sh", line 50, in print_dependency_tree_with_licenses
    dep_tree, whitelist=whitelist
  File "/home/jayvdb/projects/python/license.sh/license_sh/helpers.py", line 91, in annotate_dep_tree
    node.license_normalized = normalize_license_expression(node.license)
AttributeError: 'NoneType' object has no attribute 'license'

Originally posted by @jayvdb in #44 (comment)