dramaticlly opened a new pull request, #7652:
URL: https://github.com/apache/iceberg/pull/7652
This fix help throw proper validation exception instead of
NullPointerException when create branch or tag on iceberg table without any
snapshot.
## Before
```scala
Before
```scala
scala> val snapshotId =
branchOptions.snapshotId.getOrElse(table.currentSnapshot().snapshotId())
java.lang.NullPointerException
at $anonfun$res38$1(<console>:47)
at scala.runtime.java8.JFunction0$mcJ$sp.apply(JFunction0$mcJ$sp.java:23)
at scala.Option.getOrElse(Option.scala:189)
... 51 elided
```
After
```scala
scala> val snapshotId: java.lang.Long = branchOptions.snapshotId
.orElse(Option(iceberg.table.currentSnapshot()).map(_.snapshotId()))
.map(java.lang.Long.valueOf)
.orNull
snapshotId: Long = null
```
CC @amogh-jahagirdar @zhangbutao
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