fix(HAL handling): use Object.keys on _embedded
fix(HAL handling): use Object.keys on _embedded

lightswitch05/camunda-bpm-sdk-js,camunda/camunda-bpm-sdk-js,nagyistoce/camunda-bpm-sdk-js,camunda/camunda-bpm-sdk-js,lightswitch05/camunda-bpm-sdk-js,nagyistoce/camunda-bpm-sdk-js