Markdown Toc raise Error

[Sun Fu]

Describe the bug

When I use the buildin :Vista toc for markdown file, will raise an error

Error detected while processing function vista#[18]..vista#sidebar#Toggle[4]..vista#sidebar#Open[6]..vista#toc#Run[11]..<SNR>158_TryRunExtension[9]..vista#extension#markdown#Execute[4]..vista#renderer#markdown_like#MD[2]..<SNR>163_MD[1]..<SNR>163_BuildRo
w:
line    2:
E684: list index out of range: 0
E116: Invalid arguments for function s:Join

Use :Vista ctags works but ugly.

Environment:

• OS: macOS && Ubuntu 20.04
• Vim/Neovim version: neovim 0.6 && neovim 0.7
• This plugin version: origin/master
• I'm using universal-ctags:
  • Ctags version: newest
• I'm using some LSP client:
  • Related Vim LSP client: coc
  • Have you tried updated to the latest version of this LSP client: Yes

Vista info

Error detected while processing function vista#[18]..vista#sidebar#Toggle[4]..vista#sidebar#Open[6]..vista#toc#Run[11]..<SNR>158_TryRunExtension[9]..vista#extension#markdown#Execute[4]..vista#renderer#markdown_like#MD[2]..<SNR>163_MD[1]..<SNR>163_BuildRo
w:
line    2:
E684: list index out of range: 0
E116: Invalid arguments for function s:Join