Sanity check against negative differences in pairwise_diff [skip hazardlib]
Sanity check against negative differences in pairwise_diff [skip hazardlib]


Former-commit-id: 1999c63bccb89a0f61a49ddb1df7237e55427a5a [formerly d92759dfabcece2d8b300e53bb64dd8aebb61238]
Former-commit-id: 72c3d265d5f605652a9483214e890a1321b7a413
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine