CommonMessaging: fix unitialized retrieval of MsgSvc
if the MsgSvc is retrived by a client via the msgSvc() interface before the MsgStream is created, it will return a null ptr. This reverts the change that created the MsgSvc when needed.
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if the MsgSvc is retrived by a client via the msgSvc() interface before the MsgStream is created, it will return a null ptr. This reverts the change that created the MsgSvc when needed.