Follow up change: NPE in IntermediateStateCalc

[desaikomal]

Issues

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Description

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Junkai in my previous PR commented that we shouldn't continue but skip sorting message priority but still proceed with message throttling.
Here is the link to previous review: #2668

Tests

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[ERROR] Failures: 
[ERROR]   TestNoThrottleDisabledPartitions.testDisablingTopStateReplicaByDisablingInstance:98 expected:<false> but was:<true>
[ERROR]   TestClusterMaintenanceMode.testMaintenanceHistory:412 expected:<EXIT> but was:<ENTER>
[ERROR] Tests run: 1369, Failures: 2, Errors: 0, Skipped: 5
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:3.0.0-M3:test (default-test) on project helix-core: There are test failures.
[ERROR] 

Skip tests are due to jackson mismatch.
testExpiredOnDemandRebalanceTimestamp(Waged)
testExpiredOnDemandRebalanceTimestamp(Delayed)
testOnDemandRebalance
testOnDemandRebalanceAfterDelayRebalanceHappen (Waged)
testOnDemandRebalanceAfterDelayRebalanceHappen (Delayed)

START TestDelayedWagedRebalanceWithRackaware at Wed Oct 18 04:00:47 PDT 2023
646346 [TestNGInvoker-testDisableDelayRebalanceInCluster()] ERROR org.apache.helix.zookeeper.datamodel.serializer.ZNRecordSerializer [] - Exception during deserialization of bytes: 1
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `org.apache.helix.zookeeper.datamodel.ZNRecord` (although at least one Creator exists): no int/Int-argument constructor/factory method to deserialize from Number value (1)
 at [Source: (ByteArrayInputStream); line: 1, column: 1]
        at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63) ~[jackson-databind-2.12.6.1.jar:2.12.6.1] 
        at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1588) ~[jackson-databind-2.12.6.1.jar:2.12.6.1]
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[desaikomal]

Thanks @junkaixue for your review.
This change is ready to be merged.
Commit message: Follow up change to NPE in intermediate stage, we should not skip message throttling in case of missing partition's preference list.