fix(files.current_buffer_fuzzy_find): fix nil indexing on enter if nothing is selected (#2678)

(cherry picked from commit 2c1ed33a6f)

lua/telescope/builtin/__files.lua

@@ -514,6 +514,10 @@ files.current_buffer_fuzzy_find = function(opts)
         action_set.select:enhance {
           post = function()
             local selection = action_state.get_selected_entry()
+            if not selection then
+              return
+            end
+
             vim.api.nvim_win_set_cursor(0, { selection.lnum, 0 })
           end,
         }