cleanup based on feedback

Author: weaverryan

src/Flex.php

@@ -60,7 +60,8 @@
  */
 class Flex implements PluginInterface, EventSubscriberInterface
 {
-    public static $storedOperations = null;
+    public static $storedOperations = [];
+
     /**
      * @var Composer
      */
@@ -129,11 +130,9 @@ class_exists(__NAMESPACE__.str_replace('/', '\\', substr($file, \strlen(__DIR__)
 
         // if Flex is being upgraded, the original operations from the original Flex
         // instance are stored in the static property, so we can reuse them now.
-        if (property_exists(self::class, 'storedOperations')) {
-            if (null !== self::$storedOperations) {
-                $this->operations = self::$storedOperations;
-                self::$storedOperations = null;
-            }
+        if (property_exists(self::class, 'storedOperations') && self::$storedOperations) {
+            $this->operations = self::$storedOperations;
+            self::$storedOperations = [];
         }
 
         $symfonyRequire = preg_replace('/\.x$/', '.x-dev', getenv('SYMFONY_REQUIRE') ?: ($composer->getPackage()->getExtra()['symfony']['require'] ?? ''));