Fix ItemProcessListener#afterProcess call order in ChunkOrientedStep

The javadoc of ItemProcessListener#afterProcess states that
this method is still called with a null result, allowing for
notification of "filtered" items.

Author: fmbenhassine

spring-batch-core/src/main/java/org/springframework/batch/core/step/item/ChunkOrientedStep.java

@@ -426,13 +426,13 @@ private Chunk<O> process(Chunk<I> chunk, StepContribution contribution) throws E
 			try {
 				this.compositeItemProcessListener.beforeProcess(item);
 				O processedItem = doProcess(item);
-				this.compositeItemProcessListener.afterProcess(item, processedItem);
 				if (processedItem == null) {
 					contribution.incrementFilterCount();
 				}
 				else {
 					processedChunk.add(processedItem);
 				}
+                this.compositeItemProcessListener.afterProcess(item, processedItem);
 			}
 			catch (Exception exception) {
 				this.compositeItemProcessListener.onProcessError(item, exception);