bug fix and documentation

src/bulk_action.php

@@ -6,16 +6,6 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $db = getDbInstance();
     $json = json_decode(file_get_contents('php://input'), true);
 
-    if (isset($json['action'])) {
-        $action = filter_var($json['action'], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
-    } else {
-        echo json_encode([
-            'data' => 'Missing action field in the request.',
-            'status' => 400
-        ]);
-        exit();
-    }
-
     $params = $json['params'];
     $files = [];
 

src/forms/form_dynamic_edit.php

@@ -47,6 +47,7 @@
                 if(isset($dynamic_qrcode['id_owner'])) {
                     $owner = $users_instance->getUser($dynamic_qrcode['id_owner']);
                     echo "<option selected value=\"" . $owner["id"] . "\">" . $owner["username"] . "</option>";
+                    echo "<option value=\"\">All</option>";
                 }
 
                 $users = $users_instance->getAllUsers();