"Access Denied" shown when no VDB provider is available
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3507459. --> Reported by: [prashant.c](https://www.drupal.org/user/1936756) Related to !485 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>When no VDB provider is available, visiting the page /admin/config/ai/vdb_providers shows an "Access Denied" page, even for administrators. This is misleading because the issue is not a permission-related problem but rather the absence of a vector database provider.<br> <img src="https://www.drupal.org/files/issues/2025-02-18/Screenshot%20from%202025-02-18%2015-24-07.png" alt=""></p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>Visit the page <code>/admin/config/ai/vdb_providers</code>from the admin user without adding or configuring vector database providers.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Display informative messages like "No vector database provider available or configured." etc.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>
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