title: Discord.js, message.guild.owner returns null
body: <p>I'm coding a <code>server-info</code> command for my discord bot, and I want to get the owner username or tag from the actual guild. I found a way to do it in discord js 11, but it's not working anymore under 12th version :</p>
  <pre><code>const guild = client.guilds.get(message.guild.id);
  message.channel.send(message.guild.member(guild.owner) ? guild.owner.toString() : guild.owner.user.tag);
  // if the user is in that guild it will mention him, otherwise it will use .tag
  </code></pre>
  <p>So in discord js 12, <code>client.guilds.get</code> isn't a function, and <code>guild.owner</code> returns <code>null</code>.
  <code>message.guild.owner.user.username</code>is also returning <code>Cannot read property 'user' of null</code>.
  I took a look at the documentation, and <code>message.guild.owner</code> seems to be a real property (<a href="https://discord.js.org/#/docs/main/stable/class/Guild?scrollTo=owner" rel="nofollow noreferrer">https://discord.js.org/#/docs/main/stable/class/Guild?scrollTo=owner</a>). So I don't know why it's returning null.</p>