error when trying to run a job a second time is wrong

[pdowler]

from the client:

ca.nrc.cadc.net.RemoteServiceException: url=https://ws-sf.canfar.net/luskan/sync msg=unexpected exception: java.lang.RuntimeException: ca.nrc.cadc.uws.server.JobPhaseException: cannot execute job w58bn5y7wwatv9ex when phase = EXECUTING

the JobPhaseException goes all the way out to cadc-rest RestAction (maybe is or gets wrapped in a RuntimeException?) so the client sees a 500 when it should be a 400.