don't place eg. chests without data

DS-Minetest

2017-06-23 16146231b8f8c8562c1d1fd4a2c84bcf4134c3c5

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>