[FLINK-36088][pipeline-connector][paimon] Fix NoPointException in BucketAssignOperator.

Author: lvyanquan

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/main/java/org/apache/flink/cdc/connectors/paimon/sink/v2/bucket/BucketAssignOperator.java

@@ -130,7 +130,7 @@ public void processElement(StreamRecord<Event> streamRecord) throws Exception {
 
         if (event instanceof DataChangeEvent) {
             DataChangeEvent dataChangeEvent = (DataChangeEvent) event;
-            if (schemaMaps.containsKey(dataChangeEvent.tableId())) {
+            if (!schemaMaps.containsKey(dataChangeEvent.tableId())) {
                 Optional<Schema> schema =
                         schemaEvolutionClient.getLatestEvolvedSchema(dataChangeEvent.tableId());
                 if (schema.isPresent()) {