Better error message for MemoryError [skip CI]
Better error message for MemoryError [skip CI]


Former-commit-id: 0686a9c2fbfab80d2cd49c70859f4e705b3dcf8c [formerly 2a72c38b5a670f4ca155f7ef308469ff8a1b2c5e]
Former-commit-id: 85b6390c0beaf9151f9a5dda97c48d0d8d7f713c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine