Fixed a Python 3 issue
Fixed a Python 3 issue


Former-commit-id: 8fa8b0d6b519f75a3d59d54315e297163c25c0d1 [formerly f988e2ea6844bf4c3d326559815f7b01b8379b53]
Former-commit-id: 30cd06350abfa2d4215be7250e31c8fd4b793684
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine