refactor: Fix phpstan return.missing

Author: neznaika0

Diff for: system/Test/Mock/MockResult.php

@@ -77,6 +77,7 @@ public function dataSeek($n = 0)
      */
     protected function fetchAssoc()
     {
+        return [];
     }
 
     /**

Diff for: utils/phpstan-baseline/return.missing.neon

@@ -1,13 +1,8 @@
-# total 2 errors
+# total 1 error
 
 parameters:
     ignoreErrors:
         -
             message: '#^Method CodeIgniter\\Images\\Handlers\\BaseHandler\:\:__call\(\) should return mixed but return statement is missing\.$#'
             count: 1
             path: ../../system/Images/Handlers/BaseHandler.php
-
-        -
-            message: '#^Method CodeIgniter\\Test\\Mock\\MockResult\:\:fetchAssoc\(\) should return mixed but return statement is missing\.$#'
-            count: 1
-            path: ../../system/Test/Mock/MockResult.php