Fix ClaimQueue case of nothing scheduled on session boundary (#4065)
Same issue but about av-cores was fixed in
https://github.com/paritytech/polkadot-sdk/pull/1403
Signed-off-by: 
Andrei Sandu <andrei-mihail@parity.io>
Same issue but about av-cores was fixed in
https://github.com/paritytech/polkadot-sdk/pull/1403
Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>