always close output buffer

Author: simonLeary42

test/unit/AjaxSshValidateTest.php

@@ -24,8 +24,11 @@ public function testSshValidate(bool $is_valid, string $pubkey)
         $_SERVER["REQUEST_METHOD"] = "POST";
         $_POST["key"] = $pubkey;
         ob_start();
-        include __DIR__ . "/../../webroot/js/ajax/ssh_validate.php";
-        $output = ob_get_clean();
+        try {
+            include __DIR__ . "/../../webroot/js/ajax/ssh_validate.php";
+        } finally {
+            $output = ob_get_clean();
+        }
         if ($is_valid) {
             $this->assertEquals("true", $output);
         } else {