fixed a bug in FloatArrayField to allow null/None
fixed a bug in FloatArrayField to allow null/None


Former-commit-id: 11c4b41f00b472e361286ea0af857ba72f1e9e09 [formerly 1d4e0dbc3b15647bfff4e2daba308d99b581664f] [formerly 1d4e0dbc3b15647bfff4e2daba308d99b581664f [formerly c2d756a5bdb77f0c7498db07bc78ad3fb1e05a00]]
Former-commit-id: febd9e5c98b1ada16075535abe7fd9be8d7dc36e
Former-commit-id: da6c1bc784143f45bbac570a3d2211f478b06490
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine