[tableview] fix view selection when value is None (closes #1936781)
* in case of None on final view, use explicitly asked view anyway
* when etype is None, that means it's a non final entity type
#! /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