config: Add tests for new 'no metagenomes in refseq' check
config: Add tests for new 'no metagenomes in refseq' check

Signed-off-by: Kai Blin <ad3597797f6179d503c382b2627cc19939309418@biosustain.dtu.dk>

kblin/ncbi-genome-download,kblin/ncbi-genome-download