For users using vim.lsp.start it can be useful to get an
overview of active client that is less verbose than a full `:lua
=vim.lsp.get_active_clients()`
Problem:
vim.lsp: require("vim.lsp.health").check()
========================================================================
- ERROR: Failed to run healthcheck for "vim.lsp" plugin. Exception:
function health#check, line 20
Vim(eval):E5108: Error executing lua ...m/HEAD-6613f58/share/nvim/runtime/lua/vim/lsp/health.lua:20: attempt to index a nil value
stack traceback:
...m/HEAD-6613f58/share/nvim/runtime/lua/vim/lsp/health.lua:20: in function 'check'
[string "luaeval()"]:1: in main chunk
Solution:
Check for nil.
fix#18602
