Orion crashes for Kotlin Exercises

[ivanchimeno]

Describe the bug

Orion crashes when attempting to assess Kotlin programming exercises.

To Reproduce

1. Generate a Kotlin programming exercise
2. Participate in it
3. Asses the submission in Orion
4. Orion crashes

Output in IntelliJ

java.lang.NullPointerException: Parameter specified as non-null is null: method de.tum.www1.orion.exercise.registry.ImportedExercise., parameter language
	at de.tum.www1.orion.exercise.registry.ImportedExercise.(ImportedExercise.kt)
	at de.tum.www1.orion.exercise.registry.OrionGlobalExerciseRegistryService.createImportFileForNewProject(OrionGlobalExerciseRegistryService.java:108)
	at de.tum.www1.orion.exercise.registry.OrionGlobalExerciseRegistryService.registerExercise(OrionGlobalExerciseRegistryService.java:94)
	at de.tum.www1.orion.exercise.OrionExerciseService$assessExercise$1$1.invoke(OrionExerciseService.kt:119)
	at de.tum.www1.orion.exercise.OrionExerciseService$assessExercise$1$1.invoke(OrionExerciseService.kt:34)
	at de.tum.www1.orion.vcs.OrionGitAdapter$clone$1.onSuccess(OrionGitAdapter.kt:110)
	at com.intellij.openapi.progress.impl.CoreProgressManager.finishTask(CoreProgressManager.java:602)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.finishTask(ProgressManagerImpl.java:153)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsync$6(CoreProgressManager.java:525)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:218)
	at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:200)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLater$4(ApplicationImpl.java:319)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:84)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:133)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:46)
	at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:189)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:969)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:839)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:449)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:808)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$9(IdeEventQueue.java:448)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:781)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:496)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)