message: fix emotes not working in postgres
diff: /*
  -Copyright 2017, 2018 matrix-appservice-discord
  +Copyright 2017 - 2019 matrix-appservice-discord
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  @@ -42,7 +42,7 @@ export class DbEmoji implements IDbData {
  id: params.emoji_id,
  mxc: params.mxc_url,
  });
  - this.Result = row !== undefined;
  + this.Result = Boolean(row); // check if row exists
  if (this.Result) {
  this.EmojiId = row.emoji_id as string;
  this.Name = row.name as string;
  