Fix NullPointerException (#18034)

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>

bundles/org.openhab.binding.enocean/src/main/java/org/openhab/binding/enocean/internal/handler/EnOceanBaseSensorHandler.java

@@ -18,6 +18,7 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.Hashtable;
+import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
@@ -87,7 +88,7 @@ boolean validateConfig() {
             config.receivingEEPId.forEach(receivingEEP -> {
                 EEPType receivingEEPType = EEPType.getType(receivingEEP);
                 EEPType existingKey = receivingEEPTypes.putIfAbsent(receivingEEPType.getRORG(), receivingEEPType);
-                if (existingKey != null) {
+                if (!Objects.isNull(existingKey)) {
                     throw new IllegalArgumentException("Receiving more than one EEP of the same RORG is not supported");
                 }
             });
@@ -155,6 +156,9 @@ public void packetReceived(BasePacket packet) {
         ERP1Message msg = (ERP1Message) packet;
 
         EEPType localReceivingType = receivingEEPTypes.get(msg.getRORG());
+        if (Objects.isNull(localReceivingType)) {
+            return;
+        }
 
         EEP eep = EEPFactory.buildEEP(localReceivingType, (ERP1Message) packet);
         logger.debug("ESP Packet payload {} for {} received", HexUtils.bytesToHex(packet.getPayload()),