fixed UI Job return value

org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/.ratings

@@ -9,4 +9,4 @@ ModelEditorBindingService.java 67cb577e2b89a9c0479698a3f45cef681885227e GREEN
 ModelElementHandlerService.java 6a15bf65b8bf7879293556125e3d2224e58e24f0 GREEN
 NavigatorService.java 9a042a0ff9a21a45d98d14fe39b66e90ab974269 GREEN
 ToolingKernelUIInternal.java aefc9a6a7ebcd6ff689558ffc4300992cca89ad6 GREEN
-TutorialUIService.java d0f6ae47d6405bb2ac1407b377c86cf7772be353 GREEN
+TutorialUIService.java ed5ceafbc5856bad73e2b6024c2ec7333eff7b00 GREEN

org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/internal/TutorialUIService.java

@@ -171,7 +171,7 @@ public final class TutorialUIService implements ITutorialUIService, ITutorialUIW
 								.filter(c -> c.getKey().toString().contains(className)).findFirst();
 
 				if(!tutorialProvider.isPresent()) {
-					return null;
+					return Status.CANCEL_STATUS;
 				}
 
 				Class<? extends ITutorialProvider> clazz = tutorialProvider.get().getKey();