[deployments] wrong detection of empty update control maps

A client which doesn't support Update Control Maps fails the deployment for the following deployment:

"deploymentconstructor" : { "deploymentconstructor" : { "name" : "All devices", "artifactname" : "test-v1", "max_devices" : 0, "update_control_map" : { "states" : { "ArtifactInstall_Enter" : { "action" : "continue" } } } },

The detection of empty update control maps fails.

Acceptance criteria:

• Older clients should work  instead of receiving 409 on deployments/next