Poetry init -n causes crashes on poetry >= 1.2.0a2 #5103

root@4a73891740bc:/# poetry init -n

  IndexError

  tuple index out of range

  at ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/poetry/layouts/layout.py:91 in get_package_include
       87│ 
       88│     def get_package_include(self) -> Optional["InlineTable"]:
       89│         package = inline_table()
       90│ 
    →  91│         include = self._package_path_relative.parts[0]
       92│         package.append("include", include)
       93│ 
       94│         if self.basedir != Path():
       95│             package.append("from", self.basedir.as_posix())
root@4a73891740bc:/# poetry init -n -vvv

  Stack trace:

  9  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/application.py:330 in run
      328│ 
      329│             try:
    → 330│                 exit_code = self._run(io)
      331│             except Exception as e:
      332│                 if not self._catch_exceptions:

  8  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/poetry/console/application.py:174 in _run
      172│         self._load_plugins(io)
      173│ 
    → 174│         return super()._run(io)
      175│ 
      176│     def _configure_io(self, io: "IO") -> None:

  7  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/application.py:425 in _run
      423│                 io.set_input(ArgvInput(argv))
      424│ 
    → 425│         exit_code = self._run_command(command, io)
      426│         self._running_command = None
      427│ 

  6  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/application.py:467 in _run_command
      465│ 
      466│         if error is not None:
    → 467│             raise error
      468│ 
      469│         return event.exit_code

  5  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/application.py:451 in _run_command
      449│ 
      450│             if event.command_should_run():
    → 451│                 exit_code = command.run(io)
      452│             else:
      453│                 exit_code = ConsoleCommandEvent.RETURN_CODE_DISABLED

  4  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/commands/base_command.py:118 in run
      116│         io.input.validate()
      117│ 
    → 118│         status_code = self.execute(io)
      119│ 
      120│         if status_code is None:

  3  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/cleo/commands/command.py:85 in execute
       83│ 
       84│         try:
    →  85│             return self.handle()
       86│         except KeyboardInterrupt:
       87│             return 1

  2  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/poetry/console/commands/init.py:225 in handle
      223│         )
      224│ 
    → 225│         content = layout_.generate_poetry_content(original=pyproject)
      226│         if self.io.is_interactive():
      227│             self.line("Generated file")

  1  ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/poetry/layouts/layout.py:134 in generate_poetry_content
      132│ 
      133│         poetry_content["readme"] = f"README.{self._readme_format}"
    → 134│         packages = self.get_package_include()
      135│         if packages:
      136│             poetry_content["packages"].append(packages)

  IndexError

  tuple index out of range

  at ~/.local/share/pypoetry/venv/lib/python3.10/site-packages/poetry/layouts/layout.py:91 in get_package_include
       87│ 
       88│     def get_package_include(self) -> Optional["InlineTable"]:
       89│         package = inline_table()
       90│ 
    →  91│         include = self._package_path_relative.parts[0]
       92│         package.append("include", include)
       93│ 
       94│         if self.basedir != Path():
       95│             package.append("from", self.basedir.as_posix())