refactor/support multiple discord guilds with 1 nitrado server each + better handling for NitradoAPI

commands/event.js

@@ -72,6 +72,14 @@ module.exports = {
     */
     run: async (client, interaction, args, { GuildDB }) => {
 
+      if (!client.exists(GuildDB.Nitrado) || !client.exists(GuildDB.Nitrado.ServerID) || !client.exists(GuildDB.Nitrado.UserID) || !client.exists(GuildDB.Nitrado.Auth)) {
+        const warnNitradoNotInitialized = new EmbedBuilder()
+          .setColor(client.config.Colors.Yellow)
+          .setDescription("**WARNING:** The DayZ Nitrado Server has not been configured for this guild yet. This command or feature is currently unavailable.");
+
+        return interaction.send({ embeds: [warnNitradoNotInitialized], flags: (1 << 6) });
+      }
+
       const permissions = bitfieldCalculator.permissions(interaction.member.permissions);
       let canUseCommand = false;