Fix resolving refrence

Author: Yavor16

multiapps-controller-core/src/main/java/org/cloudfoundry/multiapps/controller/core/helpers/v3/ConfigurationReferencesResolver.java

@@ -71,11 +71,7 @@ protected List<RequiredDependency> expandRequiredDependencyIfNecessary(Propertie
         }
 
         if (!permitsMultipleResources(dependency)) {
-            if (dependencyOwner instanceof Resource resource && resource.isOptional()) {
-                return Collections.singletonList(dependency);
-            } else {
-                makeSureIsResolvedToSingleResource(dependency.getName(), resolvedReference.getResolvedResources());
-            }
+            return getSingleResolvedResource(dependencyOwner, dependency, resolvedReference);
         }
 
         if (resolvedReference.getResolvedResources()
@@ -91,6 +87,16 @@ protected List<RequiredDependency> expandRequiredDependencyIfNecessary(Propertie
         return expandedDependencies;
     }
 
+    private List<RequiredDependency> getSingleResolvedResource(PropertiesContainer dependencyOwner, RequiredDependency dependency,
+                                                               ResolvedConfigurationReference resolvedReference) {
+        if (dependencyOwner instanceof Resource resource && resource.isOptional()) {
+            return Collections.singletonList(dependency);
+        } else {
+            makeSureIsResolvedToSingleResource(dependency.getName(), resolvedReference.getResolvedResources());
+            return Collections.singletonList(dependency);
+        }
+    }
+
     private void setEmptyListProperty(PropertiesContainer dependencyOwner, RequiredDependency dependencyV3) {
         String listName = dependencyV3.getList();
         dependencyOwner.setProperties(putEmptyListProperty(dependencyOwner.getProperties(), listName));