MT#58964 do not render licenses for public platforminfo

* public access (no user) to /api/platforminfo gets only
  the default public json file without licenses rendering

Change-Id: I636e042944c7c18a08db22e9142a8624c67332c7

share/templates/api/platforminfo.tt

@@ -16,7 +16,11 @@ ELSE;
 END;
 
 TRY;
-    json = c.stash.process_json_file_cb(json_file);
+    IF !c.user_exists;
+        INCLUDE $json_file;
+    ELSE;
+        json = c.stash.process_json_file_cb(json_file);
+    END;
 CATCH;
     json = '{"error": "an internal error when fetching the config data"}';
 END;