Prevent crash

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

@@ -3727,6 +3727,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             properties.setValue(full ? "full_asked" : "images_asked", message.id, true);
 
                             SharedPreferences.Editor editor = prefs.edit();
+                            if (message.from != null)
                                 for (Address sender : message.from) {
                                     String from = ((InternetAddress) sender).getAddress();
                                     if (TextUtils.isEmpty(from))