Able to create repository on blobstore that does not exist, causing NullPointerException

Problem

The repository REST API allows create of a repository on a blobstore that does not exist. This the causes NullPointerException. 

Steps to Reproduce

1) Using REST API, create a hosted raw repo on blobstore that does not exist

2021-05-26 11:24:18,824+0100 INFO  [qtp250102189-327] admin org.sonatype.nexus.repository.manager.internal.RepositoryManagerImpl - Creating repository: internal -> OrientConfiguration{repositoryName='internal', recipeName='raw-hosted', attributes=

Unknown macro: {cleanup= Unknown macro}

, raw={contentDisposition=ATTACHMENT}, storage={strictContentTypeValidation=true, writePolicy=allow_once, blobStoreName=mks_test}}}

2) Delete newly created hosted raw repo and you get below NullPointerException

2021-05-26 11:26:23,504+0100 INFO  [qtp250102189-68] admin org.sonatype.nexus.repository.manager.internal.RepositoryManagerImpl - Deleting repository: internal

2021-05-26 11:26:23,531+0100 ERROR [qtp250102189-68] admin org.sonatype.nexus.repository.storage.StorageFacetImpl - Failed transition: STOPPED -> DELETED

java.lang.NullPointerException: null

 at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:878)

 at org.sonatype.nexus.repository.storage.internal.StorageFacetManagerImpl.enqueueDeletion(StorageFacetManagerImpl.java:85)

 at org.sonatype.nexus.common.stateguard.MethodInvocationAction.run(MethodInvocationAction.java:39)

 at org.sonatype.nexus.common.stateguard.StateGuard$GuardImpl.run(StateGuard.java:272)

 at org.sonatype.nexus.common.stateguard.GuardedInterceptor.invoke(GuardedInterceptor.java:54)

 at org.sonatype.nexus.repository.storage.StorageFacetImpl.lambda$3(StorageFacetImpl.java:224)

 at org.sonatype.nexus.orient.transaction.OrientOperations.lambda$2(OrientOperations.java:62)

 at org.sonatype.nexus.transaction.OperationPoint.lambda$0(OperationPoint.java:53)

 at org.sonatype.nexus.transaction.OperationPoint.proceed(OperationPoint.java:64)

 at org.sonatype.nexus.transaction.TransactionalWrapper.proceedWithTransaction(TransactionalWrapper.java:57)

 at org.sonatype.nexus.transaction.Operations.proceedWithTransaction(Operations.java:232)

 at org.sonatype.nexus.transaction.Operations.transactional(Operations.java:223)

 at org.sonatype.nexus.transaction.Operations.run(Operations.java:175)

 at org.sonatype.nexus.orient.transaction.OrientOperations.run(OrientOperations.java:62)

 at org.sonatype.nexus.repository.storage.StorageFacetImpl.doDelete(StorageFacetImpl.java:222)

 at org.sonatype.nexus.repository.FacetSupport.delete(FacetSupport.java:178)

Expected Behaviour

The Nexus REST API should not allow the repository to be created if blobstore does not exist or if any other setting is invalid.