Fix error when clicking 'add new content' due to JSON.parse of ''
Fix error when clicking 'add new content' due to JSON.parse of ''

When clicking 'add new content' in admin for something with available_contents, you'll the following error:
JSON::ParserError A JSON text must at least contain two octets!

This is because params[:options] is an empty string and is then passed to JSON.parse().

jsqu99/alchemy_cms,heisam/alchemy_cms,kinsomicrote/alchemy_cms,mtomov/alchemy_cms,clst/alchemy_cms,heisam/alchemy_cms,nielspetersen/alchemy_cms,akra/alchemy_cms,kinsomicrote/alchemy_cms,mixandgo/alchemy_cms,thomasjachmann/alchemy_cms,phaedryx/alchemy_cms,phaedryx/alchemy_cms,mtomov/alchemy_cms,Domenoth/alchemy_cms,akra/alchemy_cms,phaedryx/alchemy_cms,clst/alchemy_cms,paperculture/alchemy_cms,chalmagean/alchemy_cms,robinboening/alchemy_cms,nielspetersen/alchemy_cms,akra/alchemy_cms,AlchemyCMS/alchemy_cms,Domenoth/alchemy_cms,mamhoff/alchemy_cms,jsqu99/alchemy_cms,getkiwicom/alchemy_cms,watg/alchemy_cms,cygnus6/alchemy_cms,IngoAlbers/alchemy_cms,getkiwicom/alchemy_cms,clst/alchemy_cms,heisam/alchemy_cms,Domenoth/alchemy_cms,jsqu99/alchemy_cms,AlchemyCMS/alchemy_cms,paperculture/alchemy_cms,IngoAlbers/alchemy_cms,watg/alchemy_cms,cygnus6/alchemy_cms,mixandgo/alchemy_cms,mamhoff/alchemy_cms,IngoAlbers/alchemy_cms,clst/alchemy_cms,robinboening/alchemy_cms,getkiwicom/alchemy_cms,nielspetersen/alchemy_cms,phaedryx/alchemy_cms,mamhoff/alchemy_cms,mixandgo/alchemy_cms,mtomov/alchemy_cms,cygnus6/alchemy_cms,paperculture/alchemy_cms,chalmagean/alchemy_cms,Domenoth/alchemy_cms,nielspetersen/alchemy_cms,thomasjachmann/alchemy_cms,chalmagean/alchemy_cms,thomasjachmann/alchemy_cms,mtomov/alchemy_cms,watg/alchemy_cms,thomasjachmann/alchemy_cms,paperculture/alchemy_cms,watg/alchemy_cms,kinsomicrote/alchemy_cms,robinboening/alchemy_cms,kinsomicrote/alchemy_cms,chalmagean/alchemy_cms,cygnus6/alchemy_cms,akra/alchemy_cms,IngoAlbers/alchemy_cms,AlchemyCMS/alchemy_cms,getkiwicom/alchemy_cms,heisam/alchemy_cms,jsqu99/alchemy_cms,mixandgo/alchemy_cms