fix(config): use builder to create empty HealthCheckConfiguration due…

… to private constructor

src/main/java/io/fabric8/maven/docker/config/handler/property/PropertyConfigHandler.java

@@ -314,7 +314,8 @@ private HealthCheckConfiguration extractHealthCheck(HealthCheckConfiguration con
             return config;
         }
         if (config == null) {
-            config = new HealthCheckConfiguration();
+            // Create empty config to allow null safe fallback value requests during extraction
+            config = new HealthCheckConfiguration.Builder().build();
         }
 
         return new HealthCheckConfiguration.Builder()