fix: pcall vim.treesitter.get_parser

Fix #33

Author: glepnir

lua/indentmini/init.lua

@@ -116,7 +116,8 @@ end
 local function make_snapshot(lnum)
   local line_text = ffi.string(ml_get(lnum))
   local is_empty = #line_text == 0 or only_spaces_or_tabs(line_text)
-  if is_empty and treesitter.get_parser() then
+  local ok = pcall(treesitter.get_paser)
+  if is_empty and ok then
     local indent = ts_get_indent(lnum)
     if indent then
       local snapshot = {