Fix bug related to ParallelDataHandling
def to_gpu(gpu_version, cpu_version):
gpu_version = gpu_version.boundary_object_to_index_list
cpu_version = cpu_version.boundary_object_to_index_list
> if isinstance(self.data_handling, ParallelDataHandling):
E TypeError: isinstance() arg 2 must be a type or tuple of types
../pystencils/pystencils/boundaries/boundaryhandling.py:102: TypeError
None is not a type! ParallelDataHandling is None if waLBerla
is not
installed