Exception when reading empty array of variants

[olofos]

We have a server which produces objects containing an array of BaseDataType. Depending on the circumstances these can be of a few different types. This mostly works fine with clients written in asyncua. However sometimes the array is simply empty, so the server returns an array of dimension 0. This leads to an exception "could not guess UA type of variable []" on line 1000 of ua/uatypes.py. The check around there in the code looks weird to me. Why does it matter what the type is if the array is empty? Can't we just set it to eg null. From the spec I also don't see anything wrong with having an empty array of variants like this