Prevent NPE

app/src/main/java/com/sun/mail/imap/IMAPFolder.java

@@ -3640,6 +3640,7 @@ public class IMAPFolder extends Folder implements UIDFolder, ResponseHandler {
 		String uids = ir.readAtom();
 		eu.faircode.email.Log.w("VANISHED earlier=" + (earlier != null) + " uids=" + uids);
 		UIDSet[] uidset = UIDSet.parseUIDSets(uids);
+		if (uidset != null) {
 			List<Message> msgs = new ArrayList<>();
 			for (long uid : UIDSet.toArray(uidset)) {
 				Message m = uidTable.get(uid);
@@ -3652,6 +3653,7 @@ public class IMAPFolder extends Folder implements UIDFolder, ResponseHandler {
 			if (!msgs.isEmpty() &&
 					doExpungeNotification && hasMessageCountListener)
 				notifyMessageRemovedListeners(true, msgs.toArray(new Message[0]));
+		}
 /*
 	    String[] s = ir.readAtomStringList();
 	    if (s == null) {	// no (EARLIER)