fix: only add accordion toggle trigger if in subTables

[Ruesa18]

I always got the following error in the console.

Error invoking action "click->araise--table-bundle--accordion#toggle"

TypeError: Cannot read properties of null (reading 'classList')
    at extended.toggle (accordion_controller.js:21:1)
    at Binding.invokeWithEvent (stimulus.js:278:1)
    at Binding.handleEvent (stimulus.js:260:1)
    at EventListener.handleEvent (stimulus.js:31:1)

So I poked around and found out that we only use the accordion if there is a sub-table. But we set the trigger regardless. This fix only sets the trigger if there actually are sub-tables that can be opened by the accordion.

[renestalder]

Just saw that by accident.

Coming from a place of having evaluated and dealt with multiple Twig formatters for Twig project standards, I thought it might be useful to know, that having if-else clauses inside HTML Opening/Closing Tags can potentially lead to problems because formatters don't know what to do with it.

Following for example doesn't lead to the same problems:

{% set my_attribute = condition ? stimulus_action(...) : '' %}
<element {{ my_attribute }}></element>

[Ruesa18]

Thanks for your input @renestalder. I will update the code accordingly 👍

[Ruesa18]

@renestalder Alright. The changes are made. Would you like to take another look at it? 🙂