Update roles/custom/matrix-client-element/tasks/validate_config.yml

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

roles/custom/matrix-client-element/tasks/validate_config.yml

@@ -14,7 +14,7 @@
       You need to define at least one map tile server.
   when:
     - matrix_client_element_location_sharing | bool
-    - matrix_client_element_location_map_tile_servers == []
+    - matrix_client_element_location_map_tile_servers | length == 0
 
 - name: (Deprecation) Catch and report riot-web variables
   ansible.builtin.fail: