message: Fix the condition to validate undefined
diff: @@ -32,7 +32,7 @@ class AppStateHandler {
  this.id = powerSaveBlocker.start('prevent-display-sleep');
  logger.info('App-state: Prevent display to sleep, id: ' + this.id);
  } else {
  - if (this.id) {
  + if (this.id !== undefined) {
  logger.info('App-state: Allow display to sleep, id: ' + this.id);
  powerSaveBlocker.stop(this.id);
  this.id = undefined;
  