Prevent crash

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

@@ -188,10 +188,10 @@ public class ServiceSend extends ServiceBase {
                         .setCategory(NotificationCompat.CATEGORY_SERVICE)
                         .setVisibility(NotificationCompat.VISIBILITY_SECRET);
 
-        if (lastUnsent != null)
+        if (lastUnsent != null && lastUnsent.count != null)
             builder.setContentText(getResources().getQuantityString(
                     R.plurals.title_notification_unsent, lastUnsent.count, lastUnsent.count));
-        if (lastUnsent == null || lastUnsent.busy == 0)
+        if (lastUnsent == null || lastUnsent.busy == null || lastUnsent.busy == 0)
             builder.setSubText(getString(R.string.title_notification_idle));
         if (!lastSuitable)
             builder.setSubText(getString(R.string.title_notification_waiting));

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

@@ -21,6 +21,8 @@ package eu.faircode.email;
 
 import androidx.annotation.Nullable;
 
+import java.util.Objects;
+
 public class TupleUnsent {
     public Integer count;
     public Integer busy;
@@ -29,8 +31,8 @@ public class TupleUnsent {
     public boolean equals(@Nullable Object obj) {
         if (obj instanceof TupleUnsent) {
             TupleUnsent other = (TupleUnsent) obj;
-            return (this.count.equals(other.count) &&
+            return (Objects.equals(this.count, other.count) &&
-                    this.busy.equals(other.busy));
+                    Objects.equals(this.busy, other.busy));
         } else
             return false;
     }