Small fix in calc_stats
Small fix in calc_stats


Former-commit-id: 450500cb79afb86db4f2e332524449234524d22d [formerly 749bb363b3e1865b5b857958b1cab3185ff64fac]
Former-commit-id: ee5e7ece7d61077ca00922fe38f9cb9142e545d1
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine