messageHubProduce action can send an invalid response

[mdeuser]

From a recent run of the MessagingFeedTests

providers.MessagingFeedTests > Message Hub feed should fire a trigger when a message is posted to message hub STANDARD_OUT
    Creating trigger /_/BasicHealthTestTrigger-1501245762971
    Giving the consumer a moment to get ready
    Producing a message
    check failed for activation b2fbc190bc18423d96968e8024aaaf08: {"duration":9983,"name":"messageHubProduce","subject":"[email protected]","activationId":"b2fbc190bc18423d96968e8024aaaf08","publish":false,"annotations":[{"key":"limits","value":{"logs":10,"memory":256,"timeout":60000}},{"key":"path","value":"whisk.system/messaging/messageHubProduce"}],"version":"0.0.1","response":{"status":"action developer error","statusCode":0,"success":false,"result":{"error":"The action did not produce a valid response and exited unexpectedly."}},"end":1501245791865,"logs":["2017-07-28T12:43:03.886917594Z stdout: Created producer","2017-07-28T12:43:11.86445368Z  stderr: /bin/bash: line 1:     7 Killed                  python -u pythonrunner.py"],"start":1501245781882,"namespace":"[email protected]"}
    Producing a message
    check failed for activation c0f1cb7e177d435584bf9c7136b3e45a: {"duration":10632,"name":"messageHubProduce","subject":"[email protected]","activationId":"c0f1cb7e177d435584bf9c7136b3e45a","publish":false,"annotations":[{"key":"limits","value":{"logs":10,"memory":256,"timeout":60000}},{"key":"path","value":"whisk.system/messaging/messageHubProduce"}],"version":"0.0.1","response":{"status":"action developer error","statusCode":0,"success":false,"result":{"error":"The action did not produce a valid response and exited unexpectedly."}},"end":1501245805484,"logs":["2017-07-28T12:43:17.079502688Z stdout: Created producer","2017-07-28T12:43:25.483929754Z stderr: /bin/bash: line 1:     7 Killed                  python -u pythonrunner.py"],"start":1501245794852,"namespace":"[email protected]"}
    Producing a message
    Polling for activations
    Exception occurred during test execution: org.scalatest.exceptions.TestFailedException: 0 was not greater than 0