[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 [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0