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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.google.common.collect.SingletonImmutableList.(SingletonImmutableList.java:41)	at com.google.common.collect.ImmutableList.copyFromCollection(ImmutableList.java:297)	at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:260)	at com.atlassian.jira.plugins.importer.external.beans.ExternalIssue.getExternalComponents(ExternalIssue.java:144)	at com.atlassian.jira.plugins.importer.external.ExternalUtils.convertExternalIssueToIssue(ExternalUtils.java:724)	at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.createIssue(DefaultJiraDataImporter.java:748)	at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.importIssues(DefaultJiraDataImporter.java:672)	at com.atlassian.jira.plugins.importer.imports.importer.impl.DefaultJiraDataImporter.doImport(DefaultJiraDataImporter.java:298)	at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:25)	at com.atlassian.jira.plugins.importer.imports.importer.impl.ImporterCallable.call(ImporterCallable.java:14)	at com.atlassian.jira.task.TaskManagerImpl$TaskCallableDecorator.call(TaskManagerImpl.java:359)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at com.atlassian.multitenant.impl.DefaultMultiTenantManager.runForTenant(DefaultMultiTenantManager.java:61)	at com.atlassian.multitenant.juc.MultiTenantExecutors$WrappedRunnable.run(MultiTenantExecutors.java:160)	at com.atlassian.jira.task.ForkedThreadExecutor$ForkedRunnableDecorator.run(ForkedThreadExecutor.java:249)	at java.lang.Thread.run(Thread.java:662)