Send 404 when accessing non existing mining pool

backend/src/repositories/PoolsRepository.ts

@@ -80,7 +80,7 @@ class PoolsRepository {
   /**
    * Get mining pool statistics for one pool
    */
-   public async $getPool(slug: string): Promise<PoolTag> {
+   public async $getPool(slug: string): Promise<PoolTag | null> {
     const query = `
       SELECT *
       FROM pools
@@ -93,6 +93,11 @@ class PoolsRepository {
       const [rows] = await connection.query(query, [slug]);
       connection.release();
 
+      if (rows.length < 1) {
+        logger.debug(`$getPool(): slug ${slug} does not match any known pool`);
+        return null;
+      }
+
       rows[0].regexes = JSON.parse(rows[0].regexes);
       rows[0].addresses = JSON.parse(rows[0].addresses);