fixed a minor bug with trying to use sqalchemy to insert numpy.float64 type data
fixed a minor bug with trying to use sqalchemy to insert numpy.float64 type data

the fix is a simple float cast


Former-commit-id: 16c675fe80c6582b11733262522ae8532dcf873f
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine