Mingyu Li

Signed-off-by: Mingyu Li ## Changes **Added unit test** **Minor improvement to avoid fetching credentials more times than needed when initial credentials expires** ## Related Issues/PRs ## What changes are proposed...

Model validation with feature store should be supported.

4

Mode validation uses `mlflow.evaluate`. Currently it doesn't support evaluating models registered with databricks feature store.

NullPointerException in __computeSerializedValue

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Hello, I encountered the same issue as this old one https://github.com/scalapb/ScalaPB/issues/249 with a similar stacktrace. ``` java.lang.NullPointerException: null at MyMessage.__computeSerializedValue(MyMessage.scala:130) ~[classes/:?] at MyMessage.serializedSize(MyMessage.scala:137) ~[classes/:?] at com.trueaccord.scalapb.GeneratedMessage.toByteArray(GeneratedMessageCompanion.scala:93) ~[scalapb-runtime_2.12-0.5.47.jar:0.5.47] at com.trueaccord.scalapb.GeneratedMessage.toByteArray$(GeneratedMessageCompanion.scala:92) ~[scalapb-runtime_2.12-0.5.47.jar:0.5.47]...