Allowing a MPI op_dat to be defined with a null data ptr

OP-DSL / OP2-Common

OP2: open-source framework for the execution of unstructured grid applications on clusters of GPUs or multi-core CPUs

https://op-dsl.github.io

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Closed TobyFlynn closed 1 year ago

TobyFlynn commented 1 year ago

Resolves #242

Allows op_dats to be defined with a null data pointer with MPI backends in the same way as single node backends.