How to deal with empty stash lists?

Question

I have an empty stash list, as expected. I need to output some alternative content if the list is empty. I've tried using conditionals and {count} but to no prevail.

Any ideas how I can do this. I am using Stash and Expresso Store. I need to allow users to seamlessly switch between purchased and purchased products.

Any help, greatly appreciated

Here is my list

{exp:store:orders member_id='CURRENT_USER' order_by='order_date' sort='desc'}
  {items}
    {exp:channel:entries entry_id="{entry_id}" channel="series"}
        {exp:stash:set_list name="series_list" parse_tags="yes" parse_depth="3" context="{url_title}"}
           {stash:item_entry_id}{entry_id}{/stash:item_entry_id}
              {stash:item_title}{title}{/stash:item_title}
                {exp:stash:set_list:nested name="series_list_episodes" parse_tags="yes" context="{entry_id}"}
                        {series_episodes}
                           {stash:episode_title}{series_episodes:title}{/stash:episode_title}
                           {stash:episode_number}{series_episodes:episode_number}{/stash:episode_number}
                           {stash:episode_teaser}{series_episodes:series_episodes:episode_teaser}{/stash:episode_teaser}
                           {stash:episode_duration}{series_episodes:episode_duration}{/stash:episode_duration}
                           {series_episodes:episode}
                              {stash:desktop_url}{episode:desktop_url}{/stash:desktop_url}
                              {stash:mobile_url}{episode:mobile_url}{/stash:mobile_url}
                              {stash:placeholder_image}{episode:placeholder_image}{/stash:placeholder_image}
                            {/series_episodes:episode}
                        {/series_episodes}
               {/exp:stash:set_list:nested}
            {/exp:stash:set_list}
        {/exp:channel:entries}
  {/items}
{/exp:store:orders}

And here is the output:

{exp:stash:get_list name="series_list" context="{segment_3}"}
    {!-- if no results/list empty load another product --}
    {!-- chuff removed --}
  {item_title}
    {exp:stash:get_list:nested name="series_list_episodes" context="{item_entry_id}" prefix="nested" }
                {!-- bla bla this all works nicely, just stash variables used in the embed --}
    {/exp:stash:get_list:nested} 
    </ul>
{/exp:stash:get_list}

UPDATE

A little background to my issue.

I am building a ecommerce site that gives users access to some streaming video content.

From within one template I need to be able to list products which have been purchased and products which haven't been purchased.

With the list above, I was hoping to return some content based on the {segment_3} value, if there is no content, so rather than using the exp:store:orders loop, I'd use the standard channel entries loop with the url_title set to {segment_3} (i've not coded this part yet, Just at the stage where I need to return 'something' if the list returns nothing.

Answer 1

If your {exp:stash:get_list} tag is wrapped by another tag pair, then commonly used template variables like no_results are parsed for the parent tag by EE.

Add the prefix="my_prefix" parameter to provide a namespace, and use the prefix like this:

{if my_prefix:no_results}...{/if}

There are a few other ways to check that a list exists (or is empty):

With a conditional using {exp:stash:list_count}:

{if {exp:stash:list_count name="my_list"} > 0}
...
{/if}

With a conditional using {exp:stash:is_empty} or {exp:stash:not_empty}:

{if {exp:stash:not_empty name="my_list"}}
...
{/if}

Or with Switchee:

{exp:switchee variable="stash:my_list" parse="inward"}
  {case value="#^\S+#"}
     List exists
  {/case} 
  {case default="yes"}
     Doesn't exist
  {/case}
{/exp:switchee}

Use either the {if my_prefix:no_results} or the Switchee methods if you intend to process another tag when the list is empty.