MM-45542 - do not fail if site url is not set when requesting trial (#20713)

* MM-45542 - do not fail if site url is not set when requesting trial

* remove unnecessary text

Co-authored-by: Pablo Velez Vidal <pablo.velez@mattermost.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -2053,10 +2053,6 @@
     "id": "api.license.request_trial_license.fail_get_user_count.app_error",
     "translation": "Unable to get a trial license, please try again or contact with support@mattermost.com. Cannot obtain the number of registered users."
   },
-  {
-    "id": "api.license.request_trial_license.no-site-url.app_error",
-    "translation": "Unable to request a trial license. Please configure a Site URL in the web server section of the Mattermost System Console."
-  },
   {
     "id": "api.license.upgrade_needed.app_error",
     "translation": "Feature requires an upgrade to Enterprise Edition."