Routing error on invalid coordinates

[jcoupey]

Assigning coordinates that make no sense to a job, e.g. "location":[8497734.0,49909096.0] results in an obscure routing error when using OSRM:

[Error] Query string malformed close to position 14
{"code":3,"error":"Query string malformed close to position 14"}

Maybe the relayed message is clearer with other engines, but altogether this should really be a "code":2 (input error), with an explicit message about some location being crap.