perms check for reminder callback

src/structure/client/wrappers/GuildWrapper.js

@@ -96,7 +96,7 @@ class GuildWrapper {
 
     async _reminder({ reminder, user, channel, id }) {
         channel = await this.resolveChannel(channel);
-        if (channel) await channel.send({
+        if (channel && channel.permissionsFor(this.client.user).has(['ViewChannel', 'SendMessages'])) await channel.send({
             content: `<@${user}>`,
             embeds: [{
                 title: this.format('GENERAL_REMINDER_TITLE'),