Slight refactoring to reduce indentation

src/main.rs

@@ -18,27 +18,28 @@ impl EventHandler for Handler {
         old: Option<VoiceState>,
         new: VoiceState,
     ) {
-        if let Some(gid) = guild_id {
-            if let Some(rid) = ROLES_BY_SERVER.get(&gid) {
-                if let Ok(guild) = PartialGuild::get(&ctx.http, gid) {
-                    let mut roles = guild
-                        .member(&ctx.http, new.user_id)
-                        .expect("could not retrieve member")
-                        .roles;
-                    // user just joined the VC -> add the role
-                    if old.is_none() {
-                        roles.push(*rid);
-                    // user is no longer in VC -> remove the role
-                    } else if new.channel_id.is_none() {
-                        roles.retain(|r| r != rid);
-                    }
-                    if let Err(e) = guild.edit_member(&ctx.http, new.user_id, |m| m.roles(roles)) {
-                        println!(
-                            "Could not edit member {} of guild {}, {}",
-                            new.user_id, gid, e
-                        );
-                    }
-                }
+        if guild_id.is_none() || !ROLES_BY_SERVER.contains_key(&guild_id.unwrap()) {
+            return;
+        }
+        let gid = guild_id.unwrap();
+        let rid = ROLES_BY_SERVER.get(&gid).unwrap();
+        if let Ok(guild) = PartialGuild::get(&ctx.http, gid) {
+            let mut roles = guild
+                .member(&ctx.http, new.user_id)
+                .expect("could not retrieve member")
+                .roles;
+            // user just joined the VC -> add the role
+            if old.is_none() {
+                roles.push(*rid);
+            // user is no longer in VC -> remove the role
+            } else if new.channel_id.is_none() {
+                roles.retain(|r| r != rid);
+            }
+            if let Err(e) = guild.edit_member(&ctx.http, new.user_id, |m| m.roles(roles)) {
+                println!(
+                    "Could not edit member {} of guild {}, {}",
+                    new.user_id, gid, e
+                );
             }
         }
     }