Fix #119: return correct result type in the case of empty structure

Author: sibprogrammer

src/Api/Operator/Site.php

@@ -52,13 +52,13 @@ public function delete(string $field, $value): bool
      * @param string $field
      * @param int|string $value
      *
-     * @return Struct\GeneralInfo
+     * @return ?Struct\GeneralInfo
      */
-    public function get(string $field, $value): Struct\GeneralInfo
+    public function get(string $field, $value): ?Struct\GeneralInfo
     {
         $items = $this->getItems(Struct\GeneralInfo::class, 'gen_info', $field, $value);
 
-        return reset($items);
+        return reset($items) ?: null;
     }
 
     /**

tests/SiteTest.php

@@ -68,6 +68,9 @@ public function testGet()
         $this->assertEquals($site->id, $siteInfo->id);
 
         static::$client->site()->delete('id', $site->id);
+
+        $siteInfo = static::$client->site()->get('parent-id', static::$webspace->id);
+        $this->assertNull($siteInfo);
     }
 
     public function testGetHostingWoHosting()