Fix range setup for anyv regions
#211
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May sometimes call get_local_range() with a `sub_block_rank` bigger than the `sub_block_size`, in particular for the `anyv` 'serial region'. In this case immediately return `1:0` for the range, as this avoids a potential out-of-bounds array access when accessing `n_points_for_proc`.
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We may sometimes call
get_local_range()with asub_block_rankbigger than thesub_block_size, in particular for theanyv'serial region'. In this case immediately return1:0for the range, as this avoids a potential out-of-bounds array access when accessingn_points_for_proc.Fixes #210.