adjust parseMapParameters to pass test

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

Author: jimtng

bundles/org.openhab.io.yamlcomposer/src/main/java/org/openhab/io/yamlcomposer/internal/processors/FragmentUtils.java

@@ -48,7 +48,7 @@ public static record Parameters(@Nullable String name, Map<String, @Nullable Obj
 
     private static @Nullable Parameters parseMapParameters(Map<?, ?> paramsMap, String objectName) {
         if (!(paramsMap.get(objectName) instanceof String name)) {
-            return null;
+            return new Parameters(null, Map.of());
         }
         if (!(paramsMap.get("vars") instanceof Map<?, ?> varsMap)) {
             return new Parameters(name, Map.of());