Un-migrated trade data causes internal server errors

[nullstyle]

Broken http://horizon-testnet.stellar.org/trades
Works http://horizon-testnet.stellar.org/trades?order=desc

[nullstyle]

time="2018-03-13T16:18:40Z" level=error msg="select failed: sql: Scan error on column index 15: converting driver.Value type <nil> ("<nil>") to a int32: invalid syntax" pid=11579 stack="[main.go:64 session.go:262 session.go:235 trade.go:117 actions_trade.go:80 actions_trade.go:34 base.go:126 actions_trade.go:39 base.go:53 main_generated.go:145 <autogenerated>:497 router.go:119 middleware.go:88 server.go:1942 throttler.go:64 server.go:1942 cors.go:190 server.go:1942 options.go:70 server.go:1942 middleware_recover.go:27 server.go:1942 middleware_request_metrics.go:19 timer.go:212 middleware_request_metrics.go:20 server.go:1942 middleware_logger.go:33 server.go:1942 xff.go:64 server.go:1942 middleware_context.go:22 server.go:1942]"

[nullstyle]

Okay, so it looks like the issue is the history.Trade struct's PriceD and PriceN are not compatible with null columns coming from the db.