require replyto to exist (would crash otherwise anyway)

activity.go

@@ -381,19 +381,6 @@ func gimmexonks(user *WhatAbout, outbox string) {
 	}
 }
 
-func whosthere(xid string) ([]string, string) {
-	obj, err := GetJunk(xid)
-	if err != nil {
-		log.Printf("error getting remote xonk: %s", err)
-		return nil, ""
-	}
-	convoy, _ := obj.GetString("context")
-	if convoy == "" {
-		convoy, _ = obj.GetString("conversation")
-	}
-	return newphone(nil, obj), convoy
-}
-
 func newphone(a []string, obj junk.Junk) []string {
 	for _, addr := range []string{"to", "cc", "attributedTo"} {
 		who, _ := obj.GetString(addr)

web.go

@@ -1476,16 +1476,14 @@ func submithonk(w http.ResponseWriter, r *http.Request, isAPI bool) {
 	var convoy string
 	if rid != "" {
 		xonk := getxonk(userinfo.UserID, rid)
-		if xonk != nil {
+		if xonk == nil {
+			http.Error(w, "replyto disappeared", http.StatusNotFound)
+			return
+		}
 		if xonk.Public {
 			honk.Audience = append(honk.Audience, xonk.Audience...)
 		}
 		convoy = xonk.Convoy
-		} else {
-			xonkaud, c := whosthere(rid)
-			honk.Audience = append(honk.Audience, xonkaud...)
-			convoy = c
-		}
 		for i, a := range honk.Audience {
 			if a == thewholeworld {
 				honk.Audience[0], honk.Audience[i] = honk.Audience[i], honk.Audience[0]