Use SettableFuture<Empty> for readinessFuture 50/100050/1
authorRobert Varga <robert.varga@pantheon.tech>
Wed, 9 Mar 2022 17:57:01 +0000 (18:57 +0100)
committerRobert Varga <robert.varga@pantheon.tech>
Wed, 9 Mar 2022 17:57:01 +0000 (18:57 +0100)
java.lang.Void is promoting use of nulls, whereas Empty.value() is
a non-null object. Migrate internal users.

Change-Id: I6a8a85917d9c3a8c3d5a9aadf691c9d1a63a767b
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>

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