In 'Follow', ensure the actor object to be followed is here.

Due to the routing change made for the shared inboxes, local users
are not in the data storage, so this fixes it.

activitypub.c

@@ -1624,6 +1624,13 @@ int process_input_message(snac *snac, xs_dict *msg, xs_dict *req)
 
     if (strcmp(type, "Follow") == 0) { /** **/
         if (!follower_check(snac, actor)) {
+            /* ensure the actor object is here */
+            if (!object_here(actor)) {
+                xs *actor_obj = NULL;
+                actor_request(snac, actor, &actor_obj);
+                object_add(actor, actor_obj);
+            }
+
             xs *f_msg = xs_dup(msg);
             xs *reply = msg_accept(snac, f_msg, actor);