Fixed build_hcurves_and_stats [skip hazardlib] [demos]
Fixed build_hcurves_and_stats [skip hazardlib] [demos]


Former-commit-id: 7c0a7eac6e2903f786cdf298d12052af59c253a3 [formerly 497db3696fb553f25e754b1babb87a3607eb83ac]
Former-commit-id: 3cf3f986601e46f71cee3e3e78fb00f80b13a521
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine