[etwist] Fix an empty request content after a Twisted processing (closes #3546795). The content of a POST request could be empty when the Twisted server is used.

#! /bin/sh -e
 
case "$1" in
    purge)
	rm -rf /etc/cubicweb.d/
	rm -rf /var/log/cubicweb/
	rm -rf /var/lib/cubicweb/
    ;;
esac
 
#DEBHELPER#
 
exit 0