Fix crash in RM_GetCurrentUserName() when the user isn't accessible (#13619)
The crash happens whenever the user isn't accessible, for example, it isn't set for the context (when it is temporary) or in some other cases like `notifyKeyspaceEvent`. To properly check for the ACL compliance, we need to get the user name and the user to invoke other APIs. However, it is not possible if it crashes, and it is impossible to work that around in the code since we don't know (and **shouldn't know**!) when it is available and when it is not.
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