@Nonnull
    public Promise<R> getReply() {
        if (this.reply == null) {
            throw new IllegalStateException("No reply present");
        }
        return this.reply;
    }
Gets the reply.

@return the reply
@throws IllegalStateException if this object doesn't {@link #hasReply() have a reply}
helper/src/main/java/me/lucko/helper/messaging/conversation/ConversationReply.java