Error calling spatial service

[chrisala]

The ecodata logs are full of errors from a bad call to the spatial service.
e.g. error:Failed to get json from web service. class java.io.IOException Server returned HTTP response code: 500 for URL: https://spatial-test.ala.org.au/ws/intersect/object//5388516 URL= https://spatial-test.ala.org.au/ws/intersect/object//5388516

After some investigation, the source of this error appears to be a call to /ws/spatial/features with an empty "intersectWith" parameter.

This results in a call to spatial with a blank "fid" in the URL path as above resulting in the error.

The source of this in MERIT is a call to /project/spatialFeatures. I think this to to get a list of electorates and states for selection on the project admin tab to support overrides.

As an aside it would be useful to cache this one in MERIT as it's unlikely to change frequently. (And maybe add long lasting broswer cache headers as well)