Empty arrays persisted in database get demongoized and throw ArgumentError

I ended up having an empty array written to the database for my Point, and it becomes impossible to fix it from the console.

Mongoid-Geospatial will try to deserialize the empty array and instanciate the Point object from the array coordinates. It results an `ArgumentError: wrong number of arguments (given 0, expected 2..3)`

I am not sure how and if this should be handled by the gem