Fixed simple mistake with dict->AccumDict
Fixed simple mistake with dict->AccumDict


Former-commit-id: 3ad014c8c042d9eec066458bc7580301aed2a2d8 [formerly 0eb51d1d95b75f5a8e78664a0ed912be133019e1]
Former-commit-id: 20a5a4927585d896e9a4901bdb9302baa8c42e0c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine