vanity_url: Fix crash when editing a guild (#96)

robocop_ng/cogs/vanity_url.py

@@ -1,4 +1,5 @@
 from discord import Guild
+from discord.errors import Forbidden
 from discord.ext import tasks
 from discord.ext.commands import Cog
 
@@ -14,9 +15,14 @@ class VanityUrl(Cog):
 
     async def update_vanity_code(self, guild: Guild, code: str):
         if "VANITY_URL" in guild.features and guild.vanity_url_code != code:
-            await guild.edit(
-                reason="Configured vanity code was different", vanity_code=code
-            )
+            try:
+                await guild.edit(
+                    reason="Configured vanity code was different", vanity_code=code
+                )
+            except Forbidden:
+                self.bot.log.exception(f"Not allowed to edit vanity url for: {guild}")
+                self.cog_unload()
+                await self.bot.unload_extension("robocop_ng.cogs.vanity_url")
 
     @Cog.listener()
     async def on_guild_update(self, before: Guild, after: Guild):

robocop_ng/config_template.py

@@ -38,7 +38,6 @@ initial_cogs = [
     "cogs.links",
     "cogs.remind",
     "cogs.robocronp",
-    "cogs.vanity_url",
     "cogs.meme",
     "cogs.invites",
     "cogs.yubicootp",