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java.lang.NullPointerException: 	at com.atlassian.jira.issue.history.ChangeLogUtils.createChangeGroup(ChangeLogUtils.java:85)	at com.atlassian.jira.issue.util.DefaultIssueUpdater.doUpdate(DefaultIssueUpdater.java:55)	at com.atlassian.jira.service.util.handler.AbstractCommentHandler.addChangeHistoryItem(AbstractCommentHandler.java:122)	at com.atlassian.jira.service.util.handler.AbstractMessageHandler.createAttachmentWithPart(AbstractMessageHandler.java:262)	at com.atlassian.jira.service.util.handler.AbstractMessageHandler.handleMultipart(AbstractMessageHandler.java:216)	at com.atlassian.jira.service.util.handler.AbstractMessageHandler.createAttachmentsForMessage(AbstractMessageHandler.java:195)	at com.atlassian.jira.service.util.handler.AbstractCommentHandler.handleMessage(AbstractCommentHandler.java:90)	at com.atlassian.jira.service.services.mail.MailFetcherService.run(MailFetcherService.java:184)	at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:61)	at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:48)	at org.quartz.core.JobRunShell.run(JobRunShell.java:191)	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)