[BUG] App crashes when last account is removed from device's settings

This one comes from https://github.com/owncloud/android/pull/4410#issuecomment-2186212609

Steps:

1. Add one account to the device
2. Switch to device settings without closing the app
3. Accounts -> oC account -> Remove Account
4. Switch to oC account

Current:

app crashes, this is the stacktrace:

 FATAL EXCEPTION: DefaultDispatcher-worker-15
                 Process: com.owncloud.android.debug, PID: 32604
                 java.lang.NullPointerException: Parameter specified as non-null is null: method com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource$Companion.toModel, parameter <this>
                 	at com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource$Companion.toModel(Unknown Source:2)
                 	at com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource.getSpaceWithSpecialsByIdForAccount(OCLocalSpacesDataSource.kt:106)
                 	at com.owncloud.android.data.spaces.repository.OCSpacesRepository.getSpaceWithSpecialsByIdForAccount(OCSpacesRepository.kt:67)
                 	at com.owncloud.android.domain.spaces.usecases.GetSpaceWithSpecialsByIdForAccountUseCase.run(GetSpaceWithSpecialsByIdForAccountUseCase.kt:33)
                 	at com.owncloud.android.domain.spaces.usecases.GetSpaceWithSpecialsByIdForAccountUseCase.run(GetSpaceWithSpecialsByIdForAccountUseCase.kt:27)
                 	at com.owncloud.android.domain.BaseUseCase.invoke(BaseUseCase.kt:30)
                 	at com.owncloud.android.presentation.files.filelist.MainFileListViewModel$updateSpace$1.invokeSuspend(MainFileListViewModel.kt:350)
                 	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
                 	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
                 	at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:42)
                 	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
                 	Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@75ce667, Dispatchers.IO]
12:08:33.981  E  FATAL EXCEPTION: DefaultDispatcher-worker-18
                 Process: com.owncloud.android.debug, PID: 32604
                 java.lang.NullPointerException: Parameter specified as non-null is null: method com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource$Companion.toModel, parameter <this>
                 	at com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource$Companion.toModel(Unknown Source:2)
                 	at com.owncloud.android.data.spaces.datasources.implementation.OCLocalSpacesDataSource.getSpaceWithSpecialsByIdForAccount(OCLocalSpacesDataSource.kt:106)
                 	at com.owncloud.android.data.spaces.repository.OCSpacesRepository.getSpaceWithSpecialsByIdForAccount(OCSpacesRepository.kt:67)
                 	at com.owncloud.android.domain.spaces.usecases.GetSpaceWithSpecialsByIdForAccountUseCase.run(GetSpaceWithSpecialsByIdForAccountUseCase.kt:33)
                 	at com.owncloud.android.domain.spaces.usecases.GetSpaceWithSpecialsByIdForAccountUseCase.run(GetSpaceWithSpecialsByIdForAccountUseCase.kt:27)
                 	at com.owncloud.android.domain.BaseUseCase.invoke(BaseUseCase.kt:30)
                 	at com.owncloud.android.presentation.files.filelist.MainFileListViewModel$updateSpace$1.invokeSuspend(MainFileListViewModel.kt:350)
                 	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
                 	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
                 	at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:42)
                 	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
                 	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
                 	Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@b6bac14, Dispatchers.IO]

Expected:

login view displayed with no crash

Pixel 2, Android 11
997ea67d

Reproduce the account-removal steps and start with OCLocalSpacesDataSource.kt:106, following the stack through GetSpaceWithSpecialsByIdForAccountUseCase and MainFileListViewModel.kt:350. Verify the app handles removal of the final account by showing the login view without crashing.