Added an assert
Added an assert


Former-commit-id: 67b611227870724b9c40deb62e6bfb177e545df6 [formerly 67b611227870724b9c40deb62e6bfb177e545df6 [formerly 56dcdf8bf7196e02d20a9eeea9a77b95d6187a1a]]
Former-commit-id: af4cd0ee91a2af5c81f41cc03880ba890ebaa128
Former-commit-id: aafbd5f0b5e149e27869e6a3a4980eda6a785822
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine