fix stripEmptyTextNodes for IE (part of #615337)
this does not seem to make the function really work but it does not fail any more
#! /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