Fix error when clicking New index in sidebar

Fixes https://github.com/phpmyadmin/phpmyadmin/issues/17592

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

ChangeLog

@@ -15,6 +15,7 @@ phpMyAdmin - ChangeLog
 - issue #17577 Fix monitor charts size on RTL languages
 - issue #17121 Fix password_hash function incorrectly adding single quotes to password before hashing
 - issue #17586 Fix statistics not showing for empty databases
+- issue #17592 Clicking on the New index link on the sidebar does not throw an error anymore
 
 5.2.0 (2022-05-10)
 - issue #16521 Upgrade Bootstrap to version 5

templates/footer.twig

@@ -1,3 +1,4 @@
+{{ include('modals/index_dialog_modal.twig') -}}
 {% if not is_ajax %}
   </div>
 {% endif %}

test/classes/FooterTest.php

@@ -7,6 +7,7 @@ namespace PhpMyAdmin\Tests;
 use ArrayIterator;
 use PhpMyAdmin\ErrorHandler;
 use PhpMyAdmin\Footer;
+use PhpMyAdmin\Template;
 
 use function json_encode;
 
@@ -124,7 +125,7 @@ class FooterTest extends AbstractTestCase
         $footer = new Footer();
         $footer->setAjax(true);
         $this->assertEquals(
-            '',
+            (new Template())->render('modals/index_dialog_modal'),
             $footer->getDisplay()
         );
     }
@@ -163,7 +164,7 @@ class FooterTest extends AbstractTestCase
         $footer = new Footer();
         $footer->setMinimal();
         $this->assertEquals(
-            "  </div>\n  </body>\n</html>\n",
+            (new Template())->render('modals/index_dialog_modal') . "  </div>\n  </body>\n</html>\n",
             $footer->getDisplay()
         );
     }