fix(orca-clouddriver): Fix exception in mapping of trafficManagement when null

[christosarvanitis]

Fixes the mapping exception when trafficManagement is not defined in the Deploy stage definition.

Exception:

Resulted from changes in #4823

[dbyron-sf]

We're now 2 PRs deep with no tests....This needs to change. Any chance you can add one here?

[christosarvanitis]

We're now 2 PRs deep with no tests....This needs to change. Any chance you can add one here?

Yeah sure, will do until Monday. Lets hold 1.37.x for this fix though

[dbyron-sf]

We're now 2 PRs deep with no tests....This needs to change. Any chance you can add one here?

Yeah sure, will do until Monday. Lets hold 1.37.x for this fix though

Agreed. Thank you!