fix GPU bug for domain parallelization
Description
The GPU version showed random errors for specific combinations of domain parallilization, number of cores, and other details of the calculation, which seem to originate from an uninitialized GPU buffer, if a domain did not contain any projections points. This initialization is added now
News snippet
Fixed uninitialized GPU buffer.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.