feat(ShardingManager): Allow b-Eval/fetchClientValues on a specific s…

…hard when not all are ready (#5222)

Co-authored-by: BennyDiscord <46286597+BennyDiscord@users.noreply.github.com>

src/sharding/ShardingManager.js

@@ -255,13 +255,14 @@ class ShardingManager extends EventEmitter {
    */
   _performOnShards(method, args, shard) {
     if (this.shards.size === 0) return Promise.reject(new Error('SHARDING_NO_SHARDS'));
-    if (this.shards.size !== this.shardList.length) return Promise.reject(new Error('SHARDING_IN_PROCESS'));
 
     if (typeof shard === 'number') {
       if (this.shards.has(shard)) return this.shards.get(shard)[method](...args);
       return Promise.reject(new Error('SHARDING_SHARD_NOT_FOUND', shard));
     }
 
+    if (this.shards.size !== this.shardList.length) return Promise.reject(new Error('SHARDING_IN_PROCESS'));
+
     const promises = [];
     for (const sh of this.shards.values()) promises.push(sh[method](...args));
     return Promise.all(promises);