Don't clobber http://box/maps redirect if it exists!

roles/osm-vector-maps/tasks/main.yml

@@ -78,7 +78,15 @@
     state: absent
   when: not osm_vector_maps_enabled and is_debuntu
 
-- name: Copy the redirect to the test page -- delete this later if more than one map
+- name: Does the {{ vector_map_path }}/index.html redirect already exist?
+  stat:
+    path: "{{ vector_map_path }}/index.html"
+  register: osm_redirect
+
+#Copy the redirect to the test page -- delete this later if more than one map
+- name: Install redirect for http://box/maps -> http://box/osm-vector-maps/maplist/ if no redirect exists
   copy:
     src: test-index.redirect
     dest: "{{ vector_map_path }}/index.html"
+  when: osm-redirect.stat.exists
+