Given a tracker using a burnup field, if a tracker administrator wants to delete an artifact, then a fatal error is thrown:

[error] Caught exception: JavaScript module asset or with associated CSS assets must be added before the page header is written:
#0 /usr/share/tuleap/plugins/agiledashboard/include/AgileDashboard/FormElement/Burnup.php(171): Tuleap\Layout\BaseLayout->addJavascriptAsset()
#1 /usr/share/tuleap/plugins/agiledashboard/include/AgileDashboard/FormElement/Burnup.php(143): Tuleap\AgileDashboard\FormElement\Burnup->buildPresenter()
#2 /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Field.php(692): Tuleap\AgileDashboard\FormElement\Burnup->fetchArtifactValueReadOnly()
#3 /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Field.php(456): Tracker_FormElement_Field->fetchArtifactValueForWebDisplay()
#4 /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Container.php(312): Tracker_FormElement_Field->fetchArtifactReadOnly()
#5 /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Container_Fieldset.php(69): Tracker_FormElement_Container->getContainerContent()
#6 /usr/share/tuleap/plugins/tracker/include/Tracker/FormElement/Tracker_FormElement_Container.php(253): Tracker_FormElement_Container_Fieldset->fetchRecursiveArtifact()
#7 /usr/share/tuleap/plugins/tracker/include/Tracker/Tracker.class.php(573): Tracker_FormElement_Container->fetchArtifactReadOnly()
#8 /usr/share/tuleap/plugins/tracker/include/Tracker/Tracker.class.php(1547): Tracker->fetchFormElementsReadOnly()
#9 /usr/share/tuleap/plugins/tracker/include/Tracker/Tracker.class.php(896): Tracker->displayAdminConfirmDelete()
#10 /usr/share/tuleap/plugins/tracker/include/Tracker/TrackerManager.class.php(149): Tracker->process()
#11 /usr/share/tuleap/plugins/tracker/include/Tracker/TrackerManager.class.php(167): TrackerManager->processSubElement()
#12 /usr/share/tuleap/plugins/tracker/include/TrackerPluginDefaultController.php(45): TrackerManager->process()
#13 /usr/share/tuleap/src/common/Request/FrontRouter.php(252): Tuleap\Tracker\TrackerPluginDefaultController->process()
#14 /usr/share/tuleap/src/common/Request/FrontRouter.php(109): Tuleap\Request\FrontRouter->routeHandler()
#15 /usr/share/tuleap/src/www/index.php(50): Tuleap\Request\FrontRouter->route()
#16 {main}