Ensure that empty SAI column indexes do not fail on validation after full-SSTable streaming

@Test
public void testRepairWithEmptyColumnIndex() throws IOException
{
   try (Cluster cluster = init(Cluster.build(2).withConfig(config -> config.with(GOSSIP).with(NETWORK)).start()))
   {
       cluster.schemaChange(withKeyspace("CREATE TABLE %s.t (k int PRIMARY KEY, a int, b int)"));
       cluster.schemaChange(withKeyspace("CREATE INDEX ON %s.t(a) USING 'sai'"));
       cluster.schemaChange(withKeyspace("CREATE INDEX ON %s.t(b) USING 'sai'"));

       // insert a split row
       cluster.get(1).executeInternal(withKeyspace("INSERT INTO %s.t(k, a) VALUES (0, 1)"));
       cluster.get(2).executeInternal(withKeyspace("INSERT INTO %s.t(k, b) VALUES (0, 2)"));
       cluster.get(1).flush(KEYSPACE);
       cluster.get(2).flush(KEYSPACE);
       cluster.get(1).nodetoolResult("repair", KEYSPACE).asserts().success(); // fails w/ no data for the "a" index on node 2!
   }
}

java.lang.RuntimeException: Repair job has failed with the error message: Repair command #1 failed with error Repair session 55a34e20-7f24-11ee-b345-d158c708a34e for range [(-1,9223372036854775805], (9223372036854775805,-1]] failed with error Stream failed: 
Session peer /127.0.0.2:7012 Failed because of an unknown exception
java.io.UncheckedIOException: java.nio.file.NoSuchFileException: /private/var/folders/4d/zfjs7m7s6x5_l93k33r5k6680000gn/T/dtests2185335212676803469/node1/data0/distributed_test_keyspace/t-3459c6aa21753083afcc5b0c9f77c3f7/distributed_test_keyspace-t-nc-4-big-SAI+aa+t_a_idx+Meta.db
	org.apache.cassandra.index.sai.disk.v1.V1OnDiskFormat.rethrowIOException(V1OnDiskFormat.java:241)
	org.apache.cassandra.index.sai.disk.v1.V1OnDiskFormat.validatePerColumnIndexComponents(V1OnDiskFormat.java:230)
java.nio.file.NoSuchFileException: /private/var/folders/4d/zfjs7m7s6x5_l93k33r5k6680000gn/T/dtests2185335212676803469/node1/data0/distributed_test_keyspace/t-3459c6aa21753083afcc5b0c9f77c3f7/distributed_test_keyspace-t-nc-4-big-SAI+aa+t_a_idx+Meta.db
	java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)