Very non-informative error on non-existing Drop

[Qqwy]

In droppable.rb, safe_constantize is used. This means that whenever you call some_rails_model.to_liquid, instead of throwing a NameError: unitialized constant SomeRailsModelDrop, we get NoMethodError: undefined methodnew' for nil:NilClass`

So, I think that constantize would be better here than safe_constantize.