Fix: additionnal fields not displayed

[Rom1-B]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !42944

Error displaying additional fields:

glpi.CRITICAL:   *** Uncaught PHP Exception Twig\Error\RuntimeError: "An exception has been thrown during the rendering of a template ("Call to a member function find() on false") in "components/form/buttons.html.twig" at line 40." at buttons.html.twig line 40
  Backtrace :
  ./templates/components/form/buttons.html.twig:40
  ./vendor/twig/twig/src/Template.php:358            Twig\Template->yield()
  ./vendor/twig/twig/src/Template.php:373            Twig\Template->display()
  ./vendor/twig/twig/src/TemplateWrapper.php:51      Twig\Template->render()
  .../twig/twig/src/Extension/CoreExtension.php:1518 Twig\TemplateWrapper->render()
  ...tes/5d/5dcc69edb5f222b81b1acc7f4597465c.php:153 Twig\Extension\CoreExtension::include()
  ./vendor/twig/twig/src/Template.php:402            __TwigTemplate_4467dc81fd0bdecaabb758d8acd3dc7d->doDisplay()
  ...ates/0d/0d7959f196bb263eb87b71bb43f34507.php:52 Twig\Template->yield()
  ./vendor/twig/twig/src/Template.php:402            __TwigTemplate_71284a0256b260995ed83a7447ed93f8->doDisplay()
  ./vendor/twig/twig/src/Template.php:358            Twig\Template->yield()
  ./vendor/twig/twig/src/TemplateWrapper.php:61      Twig\Template->display()
  .../Glpi/Application/View/TemplateRenderer.php:188 Twig\TemplateWrapper->display()
  ./src/Glpi/Asset/Asset.php:405                     Glpi\Application\View\TemplateRenderer->display()
  ./src/CommonGLPI.php:708                           Glpi\Asset\Asset->showForm()
  ./ajax/common.tabs.php:108                         CommonGLPI::displayStandardTab()
  ...Glpi/Controller/LegacyFileLoadController.php:64 require()
  ./vendor/symfony/http-kernel/HttpKernel.php:181    Glpi\Controller\LegacyFileLoadController->__invoke()
  ./vendor/symfony/http-kernel/HttpKernel.php:76     Symfony\Component\HttpKernel\HttpKernel->handleRaw()
  ./vendor/symfony/http-kernel/Kernel.php:197        Symfony\Component\HttpKernel\HttpKernel->handle()
  ./public/index.php:71                              Symfony\Component\HttpKernel\Kernel->handle()
  Previous: Call to a member function find() on false
  ./marketplace/fields/inc/field.class.php:1154
  ./marketplace/fields/inc/field.class.php:891       PluginFieldsField::prepareHtmlFields()
  ./marketplace/fields/inc/field.class.php:991       PluginFieldsField::showDomContainer()
  ./src/Plugin.php:1826                              PluginFieldsField::showForTab()
  ...plication/View/Extension/PluginExtension.php:74 Plugin::doHook()
  ...ates/4a/4a7d2d8224fafa3a988952a5eea1b312.php:61 Glpi\Application\View\Extension\PluginExtension->callPluginHook()
  ./vendor/twig/twig/src/Template.php:402            __TwigTemplate_e44f15ee8878b27a6c536d3f6e6501f0->doDisplay()
  ./vendor/twig/twig/src/Template.php:358            Twig\Template->yield()
  ./vendor/twig/twig/src/Template.php:373            Twig\Template->display()
  ./vendor/twig/twig/src/TemplateWrapper.php:51      Twig\Template->render()
  .../twig/twig/src/Extension/CoreExtension.php:1518 Twig\TemplateWrapper->render()
  ...tes/5d/5dcc69edb5f222b81b1acc7f4597465c.php:153 Twig\Extension\CoreExtension::include()
  ./vendor/twig/twig/src/Template.php:402            __TwigTemplate_4467dc81fd0bdecaabb758d8acd3dc7d->doDisplay()
  ...ates/0d/0d7959f196bb263eb87b71bb43f34507.php:52 Twig\Template->yield()
  ./vendor/twig/twig/src/Template.php:402            __TwigTemplate_71284a0256b260995ed83a7447ed93f8->doDisplay()
  ./vendor/twig/twig/src/Template.php:358            Twig\Template->yield()
  ./vendor/twig/twig/src/TemplateWrapper.php:61      Twig\Template->display()
  .../Glpi/Application/View/TemplateRenderer.php:188 Twig\TemplateWrapper->display()
  ./src/Glpi/Asset/Asset.php:405                     Glpi\Application\View\TemplateRenderer->display()
  ./src/CommonGLPI.php:708                           Glpi\Asset\Asset->showForm()
  ./ajax/common.tabs.php:108                         CommonGLPI::displayStandardTab()
  ...Glpi/Controller/LegacyFileLoadController.php:64 require()
  ./vendor/symfony/http-kernel/HttpKernel.php:181    Glpi\Controller\LegacyFileLoadController->__invoke()
  ./vendor/symfony/http-kernel/HttpKernel.php:76     Symfony\Component\HttpKernel\HttpKernel->handleRaw()
  ./vendor/symfony/http-kernel/Kernel.php:197        Symfony\Component\HttpKernel\HttpKernel->handle()
  ./public/index.php:71                              Symfony\Component\HttpKernel\Kernel->handle()

Screenshots (if appropriate):