src/vs/workbench/common/memento.ts/ScopedMemento/save
class ScopedMemento:	save(): void {
		if (!isEmptyObject(this.mementoObj)) {
			this.storageService.store(this.id, JSON.stringify(this.mementoObj), this.scope, this.target);
		} else {
			this.storageService.remove(this.id, this.scope);
		}
	}