[web/views] Fix exception in CWProperty edit form (closes #5087412) Also add missing help message. The overall display is ugly, but at least the message is shown.

#! /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