Fix QA

Author: gmazzap

psalm.xml

@@ -23,6 +23,7 @@
 
     <issueHandlers>
         <MixedAssignment errorLevel="suppress" />
+        <MissingClassConstType errorLevel="suppress" />
         <UnresolvableInclude errorLevel="suppress" />
     </issueHandlers>
 </psalm>

src/Utils/InstalledPackages.php

@@ -96,7 +96,7 @@ private function parse(): array
         $locker = $this->composer->getLocker();
         $key = spl_object_hash($locker);
 
-        if (!empty(self::$cache[$key])) {
+        if (isset(self::$cache[$key])) {
             /** @var array<string, array|InstalledArrayRepository> $cache */
             $cache = self::$cache[$key];