Adds a null check when reading an S3EventNotification for records. Some recent change resulted in ObjectMapper::treeToValue return null for an empty string. (#5933)

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

data-prepper-plugins/s3-source/src/main/java/org/opensearch/dataprepper/plugins/source/s3/parser/S3EventNotificationParser.java

@@ -20,7 +20,7 @@ public ParsedMessage parseMessage(final Message message, final ObjectMapper obje
             final JsonNode eventNode = getS3EventNode(parsedNode, objectMapper);
 
             final S3EventNotification s3EventNotification = objectMapper.treeToValue(eventNode, S3EventNotification.class);
-            if (s3EventNotification.getRecords() != null) {
+            if (s3EventNotification != null && s3EventNotification.getRecords() != null) {
                 return new ParsedMessage(message, s3EventNotification.getRecords());
             } else {
                 LOG.debug("SQS message with ID:{} does not have any S3 event notification records.", message.messageId());