public static Map<String, Object> getYamlObjectValue(Map<String, Object> yamlObject,
            String key) throws YamlConvertException {
        return getYamlObjectValue(yamlObject, key, false);
    }
public static Map < String , Object > getYamlObjectValue ( Map < String , Object > yamlObject , String key ) throws YamlConvertException { return getYamlObjectValue ( yamlObject , key , false ) ; }
for null or not found, returns null