Made setHook method a little clearer to read

Author: alexandrmazur96

src/Runner/Installer.php

@@ -138,24 +138,28 @@ public function setMoveExistingTo(string $backup): Installer
      */
     public function setHook(string $hook): Installer
     {
-        if (!empty($hook)) {
-            $hooks = explode(',', $hook);
-            if ($hooks === false) {
-                throw new Exception\InvalidHookName('Invalid hook name \'' . $hook . '\'');
-            }
-            $hooks = array_map('trim', $hooks);
-            $hooksValidationCallback = static function (string $hook): bool {
-                return !HookUtil::isInstallable($hook);
-            };
-            if (!empty(($invalidHooks = array_filter($hooks, $hooksValidationCallback)))) {
-                throw new Exception\InvalidHookName(
-                    'Invalid hook name \'' . implode(',', $invalidHooks) . '\''
-                );
-            }
+        if (empty($hook)) {
+            return $this;
+        }
+
+        $hooks = explode(',', $hook);
+        if ($hooks === false) {
+            throw new Exception\InvalidHookName('Invalid hook name \'' . $hook . '\'');
+        }
+
+        $hooks = array_map('trim', $hooks);
 
-            $this->hooksToHandle = $hooks;
+        $hooksValidationCallback = static function (string $hook): bool {
+            return !HookUtil::isInstallable($hook);
+        };
+        if (!empty(($invalidHooks = array_filter($hooks, $hooksValidationCallback)))) {
+            throw new Exception\InvalidHookName(
+                'Invalid hook name \'' . implode(',', $invalidHooks) . '\''
+            );
         }
 
+        $this->hooksToHandle = $hooks;
+
         return $this;
     }