fix(utils): return empty string for nil args_repr

Author: haithium

spec/utils_spec.lua

@@ -66,6 +66,7 @@ describe("mods.utils", function()
   -- stylua: ignore
   tests = {
     ---------input----------|------expected--------
+    { nil                   , ""                  },
     { {                   } , ""                  },
     { { "a", 1, true      } , '"a", 1, true'      },
     { { "x", "y", "z", {} } , '"x", "y", "z", {}' },

src/mods/utils.lua

@@ -70,8 +70,10 @@ function M.keypath(...)
 end
 
 function M.args_repr(v)
-  local s = inspect(v, { process = remove_mt })
-  return s:gsub("^%s*{%s*(.-)%s*}%s*$", "%1")
+  if v == nil then
+    return ""
+  end
+  return inspect(v, { process = remove_mt }):gsub("^%s*{%s*(.-)%s*}%s*$", "%1")
 end
 
 function M.assert_arg(argn, v, validator, optional, msg)

types/utils.lua

@@ -56,7 +56,7 @@ function M.keypath(...) end
 ---> Requires [`inspect`](https://github.com/kikito/inspect.lua)
 ---
 ---@section Formatting
----@param v table|any Value to format.
+---@param v any Value to format. `nil` returns an empty string.
 ---@return string out Argument list string.
 ---@nodiscard
 function M.args_repr(v) end