[ISSUE #3877] Remove unnecessary Exception thrown by MQClientAPIImpl#createSubscriptionGroup

[HScarb]

What is the purpose of the change

Fix #3877

Brief changelog

Remove unnecessary Exception thrown by MQClientAPIImpl#createSubscriptionGroup

Verifying this change

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[coveralls]

Coverage decreased (-0.04%) to 51.514% when pulling f22e342 on HScarb:issue_3877 into b606d9c on apache:develop.