[fix][broker] Avoid IllegalStateException when marker_type field is not set in publishing (#24087)

(cherry picked from commit 3e6f7de)

Author: lhotari

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/MessageDeduplication.java

@@ -372,7 +372,7 @@ private void setContextPropsIfRepl(PublishContext publishContext, ByteBuf header
             // Message is coming from replication, we need to use the replication's producer name, ledger id and entry
             // id for the purpose of deduplication.
             MessageMetadata md = Commands.peekMessageMetadata(headersAndPayload, "Check-Deduplicate", -1);
-            if (Markers.isReplicationMarker(md.getMarkerType())) {
+            if (md != null && md.hasMarkerType() && Markers.isReplicationMarker(md.getMarkerType())) {
                 publishContext.setProperty(MSG_PROP_IS_REPL_MARKER, "");
             }
             return;