Bug: Crash on tab completing xonsh

[midirhee12]

Current Behavior

While in xonsh --no-rc, hit <tab> after typing:

$ xonsh --no-rc --no-

Traceback:

Unhandled exception in event loop:
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/prompt_toolkit/buffer.py", line 1920, in new_coroutine
    await coroutine(*a, **kw)
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/prompt_toolkit/buffer.py", line 1744, in async_completer
    async for completion in async_generator:
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/prompt_toolkit/completion/base.py", line 323, in get_completions_async
    async for completion in completer.get_completions_async(
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/prompt_toolkit/completion/base.py", line 199, in get_completions_async
    for item in self.get_completions(document, complete_event):
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/ptk_shell/completer.py", line 59, in get_completions
    completions, plen = self.completer.complete(
                        ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/completer.py", line 122, in complete
    return self.complete_from_context(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/completer.py", line 273, in complete_from_context
    for comp in self.generate_completions(
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/completer.py", line 234, in generate_completions
    for comp in res:
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/cli_utils.py", line 485, in complete
    opt_completions = self._complete_options(options)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/yd9951zrb3a4d84df3qgd11dv7c03byf-python3-3.11.9-env/lib/python3.11/site-packages/xonsh/cli_utils.py", line 535, in _complete_options
    act, _, value = act_res
    ^^^^^^^^^^^^^

Exception too many values to unpack (expected 3)
Press ENTER to continue...

Expected Behavior

Show the expected tab completions below the cursor instead of crashing:

$ xonsh --no-rc --no-
                     --no-rc           --no-script-cache

For community

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Duplication #5471

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