Fix underlying cause of breakage of trips-for-location API call

This PR fixes breakage of the trips-for-location API call, which was due to underlying changes in BlockGeospatialServiceImpl in d7cbb75f.

The first reports of this issue were on the Puget Sound instance (issue #46 and [the API mailing list](https://groups.google.com/d/topic/onebusaway-api/ygj7_s3LkLw/discussion)), and I verified that the issue existed locally as well (that is, it wasn't just a Puget Sound data or configuration problem).

With this patch applied the trips-for-location API call returns the expected results.