I have an LSP that is returning markdown code blocks on Hover with no
language specified, e.g.
````
```
Foobar
```
````
As a result, you get "```" in the message line which is not that useful.
I made the regex to catch the first code fence accept empty language as
well, and if it's empty, we set it to "text".
This makes it so that LSPs that return no language still produce legible
restuls on the message line.
Co-authored-by: Oliver Ruben Albertini <ora@fb.com>
rust-analyzer sometimes returns a hover result with language being
"text", but there's no syntax/text.vim, so this would fail with:
Error detected while processing function <SNR>150_VimOutputCallback[6]..<lambda>8[1]..ale#lsp#HandleMessage[30]..ale#hover#HandleLSPResponse[42]..ale#floating_preview#Show[13]..<SNR>161_VimShow:
line 13:
E484: Cannot open file syntax/text.vim
Only including the file when it actually exists fixes this.
