final fix

tasks/main.yml

@@ -41,7 +41,7 @@
       sudo docker-compose unpause
   when:
     - "'docker' in group_names"
-    - docker_project_name
+    - docker_project_name is defined
 
 - name: "Copy the backup script"
   blockinfile:
@@ -56,8 +56,7 @@
       export RESTIC_PASSWORD={{ restic_password }}
 
       restic backup /home/andreas --exclude-file=/etc/restic/excludes.txt
-  when: (docker_project_name is undefined and "'docker' in group_names") or
-    ("'docker' not in group_names")
+  when: docker_project_name is undefined
 
 - name: "Create the restic config dir"
   file: