fix that the last timeseries is not removed of the diagram
fix that the last timeseries is not removed of the diagram

52North/js-sensorweb-client,EHJ-52n/js-sensorweb-client,52North/js-sensorweb-client,janschulte/js-sensorweb-client,janschulte/js-sensorweb-client,EHJ-52n/js-sensorweb-client