Prevent NPE

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

@@ -3640,18 +3640,20 @@ 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);
-		List<Message> msgs = new ArrayList<>();
-		for (long uid : UIDSet.toArray(uidset)) {
-			Message m = uidTable.get(uid);
-			if (m != null && m.getMessageNumber() > 0) {
-				realTotal--;
-				messageCache.expungeMessage(m.getMessageNumber());
-				msgs.add(m);
+		if (uidset != null) {
+			List<Message> msgs = new ArrayList<>();
+			for (long uid : UIDSet.toArray(uidset)) {
+				Message m = uidTable.get(uid);
+				if (m != null && m.getMessageNumber() > 0) {
+					realTotal--;
+					messageCache.expungeMessage(m.getMessageNumber());
+					msgs.add(m);
+				}
 			}
+			if (!msgs.isEmpty() &&
+					doExpungeNotification && hasMessageCountListener)
+				notifyMessageRemovedListeners(true, msgs.toArray(new Message[0]));
 		}
-		if (!msgs.isEmpty() &&
-				doExpungeNotification && hasMessageCountListener)
-			notifyMessageRemovedListeners(true, msgs.toArray(new Message[0]));
 /*
 	    String[] s = ir.readAtomStringList();
 	    if (s == null) {	// no (EARLIER)