NPE under some conditions when rollbacking an attachment

07:39:25.008 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: java.lang.NullPointerException: null
07:39:25.008 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2314)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at org.apache.commons.io.IOUtils.copy(IOUtils.java:2270)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2291)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at org.apache.commons.io.IOUtils.copy(IOUtils.java:2246)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at com.xpn.xwiki.doc.XWikiAttachmentContent.setContent(XWikiAttachmentContent.java:313)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at com.xpn.xwiki.doc.XWikiAttachment.setContent(XWikiAttachment.java:1052)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at com.xpn.xwiki.doc.XWikiAttachment.apply(XWikiAttachment.java:1285)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at com.xpn.xwiki.XWiki.rollback(XWiki.java:7032)
07:39:25.009 [tc-okhttp-stream-288379071] INFO  o.x.t.d.i.j.s.ServletContainerExecutor - STDOUT: 	at com.xpn.xwiki.web.DeleteVersionsAction.action(DeleteVersionsAction.java:79)