fix tests

Signed-off-by: wind57 <[email protected]>

Author: wind57

spring-cloud-kubernetes-commons/src/main/java/org/springframework/cloud/kubernetes/commons/config/SourceDataFlattener.java

@@ -37,7 +37,7 @@ static Map<String, Object> defaultFlattenedSourceData(LinkedHashSet<String> name
 
 		names.forEach(name -> {
 			@SuppressWarnings("unchecked")
-			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.get(name);
+			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.getOrDefault(name, Map.of());
 			flattenedData.putAll(singleDataEntry);
 		});
 
@@ -53,7 +53,7 @@ static Map<String, Object> prefixFlattenedSourceData(LinkedHashSet<String> names
 
 		names.forEach(name -> {
 			@SuppressWarnings("unchecked")
-			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.get(name);
+			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.getOrDefault(name, Map.of());
 			singleDataEntry.forEach((key, value) -> flattenedData.put(prefix + "." + key, value));
 		});
 
@@ -69,7 +69,7 @@ static Map<String, Object> nameFlattenedSourceData(LinkedHashSet<String> names,
 
 		names.forEach(name -> {
 			@SuppressWarnings("unchecked")
-			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.get(name);
+			Map<String, Object> singleDataEntry = (Map<String, Object>) rawData.getOrDefault(name, Map.of());
 			singleDataEntry.forEach((key, value) -> flattenedData.put(name + "." + key, value));
 		});