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Call onDismissed on dismiss even mUserSwitchingDialog is null.
In HSUM, mUserSwitchingDialog is not shown for the initial user switch which is from system user to the main user. And for that switch, completeUserSwitch step was not working properly to call user switch complete events, like UserSwitchObserver.onUserSwitchComplete and ACTION_USER_SWITCHED broadcasts, etc. This CL fixes that problem. Bug: 279958141 Test: manual Change-Id: I94cfd0229a128f37aa09cb1a00a425bbe7d92e1c