Revert "LuaLS#693 fix"

This reverts commit 934b5c9.

Author: sumneko

3rd/lni

@@ -286,7 +286,7 @@ function m.getBlock(obj)
  return obj
  end
  if obj == obj.parent then
- error('obj == obj.parent?' .. obj.type)
+ error('obj == obj.parent?', obj.type)
  end
  obj = obj.parent
  end