Create outbox if needed

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

@@ -447,6 +447,12 @@ public class EntityRule {
         if (answer == null)
             throw new IllegalArgumentException("Rule answer not found name=" + name);
 
+        EntityFolder outbox = db.folder().getOutbox();
+        if (outbox == null) {
+            outbox = EntityFolder.getOutbox();
+            outbox.id = db.folder().insertFolder(outbox);
+        }
+
         Address[] from = new InternetAddress[]{new InternetAddress(identity.email, identity.name, StandardCharsets.UTF_8.name())};
 
         // Prevent loop
@@ -463,7 +469,7 @@ public class EntityRule {
 
         EntityMessage reply = new EntityMessage();
         reply.account = message.account;
-        reply.folder = db.folder().getOutbox().id;
+        reply.folder = outbox.id;
         reply.identity = identity.id;
         reply.msgid = EntityMessage.generateMessageId();