Fix StorageScheduler crash on devices without sensor in flex-model#2085

saerts-gp wants to merge 1 commit intoFlexMeasures:mainFlexMeasures/flexmeasures:mainfrom

saerts-gp:fix/storage-scheduler-none-sensor-guardsaerts-gp/flexmeasures:fix/storage-scheduler-none-sensor-guardCopy head branch name to clipboard