Merge branch 'upgrade-metadata' into 'main'

Protect against missing metadata

See merge request weblogic-cloud/weblogic-kubernetes-operator!4795

Author: rjeberhard

common/src/main/java/oracle/kubernetes/common/utils/SchemaConversionUtils.java

@@ -1,4 +1,4 @@
-// Copyright (c) 2022, 2023, Oracle and/or its affiliates.
+// Copyright (c) 2022, 2024, Oracle and/or its affiliates.
 // Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl.
 
 package oracle.kubernetes.common.utils;
@@ -561,7 +561,7 @@ Map<String, Object> getStatus(Map<String, Object> domain) {
   }
 
   Map<String, Object> getMetadata(Map<String, Object> domain) {
-    return (Map<String, Object>) domain.get(METADATA);
+    return (Map<String, Object>) domain.computeIfAbsent(METADATA, k -> new LinkedHashMap<>());
   }
 
   @SuppressWarnings("unchecked")