do not close debugwindow twice
do not close debugwindow twice

this is already handled in the close.djDebug event listener

django-debug-toolbar/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,jazzband/django-debug-toolbar,spookylukey/django-debug-toolbar,jazzband/django-debug-toolbar,spookylukey/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,tim-schilling/django-debug-toolbar,tim-schilling/django-debug-toolbar,tim-schilling/django-debug-toolbar,jazzband/django-debug-toolbar,spookylukey/django-debug-toolbar