fix wrong check in genAllGather excluding rank 0 from prev #205
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There is an error when initializing prevranks as
prevranks = {rank_it->first}, which should be skipped in case the rank is -1.Only in the AllGather, only for the PXN case, and only for chunkid > 0, this check is wrong:
if (rank_it->first) {...}, which skips the case where the rank is 0, instead of -1.