Invalid test result for OMobilities/GET or IMobility-TORs/GET

[ctu-developers]

There is same validation test for unknown HEI ID in the OMobilities/GET and IMobility-TORs/GET.

For OMobilities/GET with info "Request for one of known omobility_ids with unknown sending_hei_id, expect 400."
For TORs/GET with info "Request for one of known omobility_ids with unknown receiving_hei_id, expect 200 and empty response."

But the specification is identical for both endpoints. There is no info about HTTP_400 for invalid HEI.

One of the tests must be wrong. See...

This may be a similar problem to #43