Fix potential edge case unseen messages

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -154,7 +154,9 @@ public class ServiceSynchronize extends ServiceBase {
 
             @Override
             public void onChanged(TupleMessageStats stats) {
-                if (stats != null) {
+                if (stats == null)
+                    stats = new TupleMessageStats();
+
                 boolean unseen_ignored = prefs.getBoolean("unseen_ignored", false);
                 if (!unseen_ignored || stats.ignored == null)
                     stats.ignored = 0;
@@ -166,7 +168,6 @@ public class ServiceSynchronize extends ServiceBase {
                     setUnseen(stats.unseen - stats.ignored);
                 }
             }
-            }
         });
 
         final TwoStateOwner cowner = new TwoStateOwner(this, "liveUnseenNotify");

app/src/main/java/eu/faircode/email/TupleMessageStats.java

@@ -25,8 +25,8 @@ import androidx.annotation.Nullable;
 import java.util.Objects;
 
 public class TupleMessageStats {
-    public Integer unseen;
+    public Integer unseen = 0;
-    public Integer ignored;
+    public Integer ignored = 0;
 
     @Override
     public boolean equals(@Nullable Object obj) {