How to check if a record is empty? (No keys)

Hi everyone, do we have any workaround to check for an Appian record which is null(does not have any key)? One way is check for a!keys and then check if empty, any other way?

So basically we had a use where there are multiple grid but they being sourced from the same record, let's suppose it be a room. So parent interface has parent room record variable and in child interface(contained each grid based on room type) we are sending parent by indexing the types. For deletion case, we are saving "null" in the same variable if it is new and if something already exist in db then update the isActive flag to false. Before saving the parent room record(which has all type of rooms) we were doing a reject to remove all the nulls. This used to work before and the "null" which we saved was still a null but now it is becoming a record type of null. Not sure if Appian fixed something on this behavior from there end or not.