[Php80] Returns null on no change on ClassPropertyAssignToConstructorPromotionRector

[samsonasik]

Add $hasChanged flag on loop to verify it to avoid show applied rules on multi rules apply:

➜  CodeIgniter4 git:(develop) ✗ vendor/bin/rector 
 956/956 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%
1 file with changes
===================

1) system/Database/Forge.php:572

    ---------- begin diff ----------
@@ @@
             }

             // Most databases don't support creating indexes from within the CREATE TABLE statement
-            if (! empty($this->keys)) {
+            if ($this->keys !== []) {
                 for ($i = 0, $sqls = $this->_processIndexes($table), $c = count($sqls); $i < $c; $i++) {
                     $this->db->query($sqls[$i]);
                 }
    ----------- end diff -----------

Applied rules:
 * SimplifyEmptyCheckOnEmptyArrayRector
 * ClassPropertyAssignToConstructorPromotionRector