[test] fix req default value handling in CubicWebTC.view (closes #2544376) It's no more than the standard ``if rset`` vs. ``if rset is None`` error.

#! /bin/sh -e

if [ -x "/etc/init.d/cubicweb-ctl" ]; then
    invoke-rc.d cubicweb-ctl restart || true
fi
 
 
#DEBHELPER#
 
exit 0