fix: Default to an empty sorter, so we always have one

lua/telescope/pickers.lua

@@ -73,7 +73,7 @@ function Picker:new(opts)
     _on_input_filter_cb = opts.on_input_filter_cb or function() end,
 
     finder = opts.finder,
-    sorter = opts.sorter,
+    sorter = opts.sorter or require('telescope.sorters').empty(),
     previewer = opts.previewer,
     default_selection_index = opts.default_selection_index,
 

lua/telescope/sorters.lua

@@ -465,6 +465,12 @@ sorters.highlighter_only = function(opts)
   }
 end
 
+sorters.empty = function()
+  return Sorter:new {
+    scoring_function = function() return 0 end,
+  }
+end
+
 -- Bad & Dumb Sorter
 sorters.get_levenshtein_sorter = function()
   return Sorter:new {