fix url when forward request to monitoringAPI  - Remove trailing question-mark if query string paramenters are not present
fix url when forward request to monitoringAPI
 - Remove trailing question-mark if query string paramenters are not present

SmartInfrastructures/FIWARELab-monitoringAPI,attybro/xifi-monitoringAPI,SmartInfrastructures/FIWARELab-monitoringAPI,attybro/FIWARELab-monitoringAPI,SmartInfrastructures/FIWARELab-monitoringAPI