fix: render body: nil instead of nothing: true

app/controllers/cron_controller.rb

app/controllers/csp_reports_controller.rb

app/controllers/pictures_controller.rb

..._page/app/controllers/ranked_vote_possibles_controller.rb

...ny_page/app/controllers/rate_many_possibles_controller.rb

.../pages/task_list_page/app/controllers/tasks_controller.rb

test/functional/csp_reports_controller.rb