title: .sendEmbed dont works for RichEmbeds
body: <p>I'm getting this:</p>
  
  <p>(node:5496) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: Cannot read prope
  rty 'map' of null</p>
  
  <p>(node:5496) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections
  that are not handled will terminate the Node.js process with a non-zero exit code.</p>
  
  <p>Everytime i run my "userinfo" command</p>
  
  <pre><code>const prefix = require('../../settings.json').prefix;
  const Discord = require('discord.js');
  const commando = require('discord.js-commando');
  
  class UserInfo extends commando.Command {
      constructor(client) {
          super(client, {
              name: 'userinfo',
              group: 'showinfo',
              memberName: 'userinfo',
              description: 'Muestra la información de un usuario.'
          });
      }
  
      async run (message, args) {
          if(message.author.bot) return;
          if(message.channel.type === "dm") return;
  
          var embed = new Discord.RichEmbed()
              .setAuthor(message.author.username)
              .setDescription("Usuario rikolino.")
              .setColor("#3535353")
              .addField("Usuario", '${message.author.username}#${message.author.discriminator}')
              .addField("ID", message.author.id)
              .addField("Creación", message.author.createdAt);
  
          message.channel.sendEmbed(embed);
          return;
      }
  }
  
  module.exports = UserInfo;
  </code></pre>