Invalid color scheme TOML silently ignored

[sclu1034]

Describe the bug

When a color scheme defined as TOML file at ~/.config/wezterm/colors contains invalid data, it is treated as non-existent. Trying to use that color scheme only yields a Your configuration specifies color_scheme="Gruvbox Light Soft" but that scheme was not found.
Only when that color scheme definition is moved to Lua does WezTerm print the actual error in the color scheme.

Environment:

OS: Linux X11
Version: wezterm 20210511-192024-a59e9b17

To Reproduce

Create a color scheme with 9 elements in the ansi or brights lists and save it in ~/.config/wezterm/colors.
Then try to apply it with color_scheme = "<file_name>"

Expected behavior

WezTerm should

• inform the user that the file does exist and where it was found, but that it contains invalid data
• print the error that occurred while parsing/loading the color scheme. The same error that it does print when the color scheme is defined in Lua.

[github-actions]

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