Fixed crash

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

@@ -2438,12 +2438,15 @@ public class ServiceSynchronize extends LifecycleService {
                 if (!metered || (attachment.size != null && attachment.size < download)) {
                     if (iattachments == null)
                         iattachments = helper.getAttachments();
+                    // Attachments of drafts might not have been uploaded yet
+                    if (i < iattachments.size()) {
                         attachment.part = iattachments.get(i).part;
                         attachment.download(context, db);
                         Log.i(Helper.TAG, folder.name + " downloaded message id=" + message.id + " attachment=" + attachment.name + " size=" + message.size);
                     }
                 }
         }
+    }
 
     private class ServiceManager extends ConnectivityManager.NetworkCallback {
         private ServiceState state;