Error: cannot compare instances of NoneType

[jeertmans]

Hello!

When trying to add a TUI to my program, see jeertmans/manim-slides#249, the TUI crashes on two subcommands: present and wizard. The crash occurs when loading the subcommand's documentation, not actually running it.
FYI, both commands launch some GUI with PySide6.

I have attached the full error traceback below. As it is quite long and not very easy to understand, I was hoping to get some help here :-)

Thanks!

───────────────────── Traceback (most recent call last) ──────────────────────╮
│ /home/eertmans/.cache/pypoetry/virtualenvs/manim-slides-M-PeeMP--py3.10/lib/ │
│ python3.10/site-packages/trogon/trogon.py:171 in update_command_data         │
│                                                                              │
│   168 │   @on(CommandForm.Changed)                                           │
│   169 │   def update_command_data(self, event: CommandForm.Changed) -> None: │
│   170 │   │   self.command_data = event.command_data                         │
│ ❱ 171 │   │   self._update_execution_string_preview(                         │
│   172 │   │   │   self.selected_command_schema, self.command_data            │
│   173 │   │   )                                                              │
│   174                                                                        │
│                                                                              │
│ ╭───────── locals ─────────╮                                                 │
│ │ event = Changed()        │                                                 │
│ │  self = CommandBuilder() │                                                 │
│ ╰──────────────────────────╯                                                 │
│                                                                              │
│ /home/eertmans/.cache/pypoetry/virtualenvs/manim-slides-M-PeeMP--py3.10/lib/ │
│ python3.10/site-packages/trogon/trogon.py:193 in                             │
│ _update_execution_string_preview                                             │
│                                                                              │
│   190 │   │   │   │   "command-name-syntax"                                  │
│   191 │   │   │   )                                                          │
│   192 │   │   │   prefix = Text(f"{self.click_app_name} ", command_name_synt │
│ ❱ 193 │   │   │   new_value = command_data.to_cli_string(include_root_comman │
│   194 │   │   │   highlighted_new_value = Text.assemble(prefix, self.highlig │
│   195 │   │   │   prompt_style = self.get_component_rich_style("prompt")     │
│   196 │   │   │   preview_string = Text.assemble(("$ ", prompt_style), highl │
│                                                                              │
│ ╭───────────────────────────────── locals ─────────────────────────────────╮ │
│ │              command_data = UserCommandData(                             │ │
│ │                             │   name='root',                             │ │
│ │                             │   options=[                                │ │
│ │                             │   │   UserOptionData(                      │ │
│ │                             │   │   │   name=[                           │ │
│ │                             │   │   │   │   '--notify-outdated-version'  │ │
│ │                             │   │   │   ],                               │ │
│ │                             │   │   │   value=(True,),                   │ │
│ │                             │   │   │   option_schema=OptionSchema(      │ │
│ │                             │   │   │   │   name=[                       │ │
│ │                             │   │   │   │   │                            │ │

│ │     Discontinued because GitHub limits the length. See attached file.    │ │
[error.txt](https://github.com/Textualize/trogon/files/12407498/error.txt)


│ │                       │   │   │   },                                     │ │
│ │                       │   │   │   parent=None,                           │ │
│ │                       │   │   │   is_group=True                          │ │
│ │                       │   │   ),                                         │ │
│ │                       │   │   is_group=False                             │ │
│ │                       │   )                                              │ │
│ │                       )                                                  │ │
│ │          value_data = [('None',)]                                        │ │
│ │ values_are_defaults = True                                               │ │
│ │     values_supplied = True                                               │ │
│ ╰──────────────────────────────────────────────────────────────────────────╯ │
╰──────────────────────────────────────────────────────────────────────────────╯
TypeError: '<' not supported between instances of 'NoneType' and 'NoneType'

error.txt