Fixed exception for objects in OSM which have no tags.
Fixed exception for objects in OSM which have no tags.

* Problem appeared for data: export♡int_name♡Schweiz♡2013-04-09T00:00:00.json

elgaard/opening_hours.js,iMi-digital/opening_hours.js,iMi-digital/opening_hours.js,iMi-digital/opening_hours.js,elgaard/opening_hours.js,elgaard/opening_hours.js,elgaard/opening_hours.js,mk-pmb/opening_hours.js,simon04/opening_hours.js,amenk/opening_hours.js,simon04/opening_hours.js,Akylas/opening_hours.js,amenk/opening_hours.js,Akylas/opening_hours.js,simon04/opening_hours.js,simon04/opening_hours.js,amenk/opening_hours.js,iMi-digital/opening_hours.js,amenk/opening_hours.js,amenk/opening_hours.js,iMi-digital/opening_hours.js,Akylas/opening_hours.js,mk-pmb/opening_hours.js,Akylas/opening_hours.js,mk-pmb/opening_hours.js,Akylas/opening_hours.js,mk-pmb/opening_hours.js,simon04/opening_hours.js,elgaard/opening_hours.js,mk-pmb/opening_hours.js