Steps to reproduce:

1. Enable `geostream.cache` in custom.conf and point it to a directory that doesn't exist (or a directory that might someday go away, like /tmp/some_directory)
2. POST a datapoint

The error thrown:

var jsonData = JSON.stringify({"badRequest": 'POST /api/geostreams/datapoints', "exceptions":'@70l66egmf: Execution exception in /Users/brockangelo/projects/clowder/app/api/Geostreams.scala:1522 at play.api.Application$class.handleError(Application.scala:293) at play.api.DefaultApplication.handleError(Application.scala:399) at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$3.apply(PlayDefaultUpstreamHandler.scala:264) at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$3.apply(PlayDefaultUpstreamHandler.scala:264)

And here is line number 1522 in Geostreams.scala at the current commit