While running RDK actions, with the action configured to use an alternative user (via Settings|Properties -> Use the following credentials), the output parameters are all being returned with "null" values. Once the action is reconfigured to "Use Server Type Credentials" (the default for an any/all actions) then it will run returning output parameter values as expected.
CA Release Automation v6.x
RDK 1.0.6/1.0.7 Created Actions
These actions apparently need internal parameters set in their output fields for it to show data.
Adding internal parameters to the output fields and run the test action again.