ADO with no media skips embargo context

[aksm]

What?

Thanks to @giancarlobi testing Drupal 9.3.0, a bug was discovered where ADOs with no media can cause something like the following error:

A notice: Notice: Undefined variable: embargo_context in Drupal\format_strawberryfield\Plugin\Field\FieldFormatter\StrawberryMediaFormatter->viewElements() (line 244 of /var/www/archipelago/web/modules/contrib/format_strawberryfield/src/Plugin/Field/FieldFormatter/StrawberryMediaFormatter.php) #0 /var/www/archipelago/web/core/includes/bootstrap.inc(346): _d
12:53
Then error: TypeError: Argument 3 passed to Drupal\Core\Cache\Cache::mergeContexts() must be of the type array, null given, called in /var/www/archipelago/web/modules/contrib/format_strawberryfield/src/Plugin/Field/FieldFormatter/StrawberryMediaFormatter.php on line 244 in Drupal\Core\Cache\Cache::mergeContexts() (line 29 of /var/www/archipelago/web/core/lib/Drupal/Core/Cache/Cache.php) #0 /var/www/archipelago/web/modules/contrib/format_strawberryfield/src/Plugin/Field/FieldFormatter/StrawberryMediaFormatter.php(244): Drupal\Core\Cache\Cache::mergeContexts() #1 /var/www/archipelago/web/core/lib/Drupal/Core/Field/FormatterBase.php(89): Drupal\format_strawberryfield\Plugin\Field\FieldFormatter\StrawberryMediaFormatter->viewElements() #2 /var/www/archipelago/web/core/lib/Drupal/Core/Entity/Entity/EntityViewDisplay.php(263): Drupal\Core\Field\FormatterBase->view()

@DiegoPino has already identified the likely culprit here:

format_strawberryfield/src/Plugin/Field/FieldFormatter/StrawberryMediaFormatter.php

Line 207 in 1d2e51d

$embargo_context = [];

[DiegoPino]

Fixed via #178