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Check nil for array

k0kubun/githubranking,k0kubun/github-ranking,k0kubun/github-ranking,k0kubun/github-ranking,k0kubun/github-ranking,k0kubun/github-ranking,k0kubun/githubranking,k0kubun/githubranking,k0kubun/githubranking,k0kubun/githubranking