Fix: Add robust filtering and conditional block for tmux config

- In 'roles/tmux/tasks/main.yml', strengthened the filter for
  creating 'user_home_dirs' to explicitly exclude empty home
  directory paths.
- Reverted 'roles/tmux/tasks/tmux_config.yml' to remove redundant
  conditionals.
- In 'roles/tmux/tasks/main.yml', wrapped the 'include_tasks' for
  'tmux_config.yml' in a block and added a robust 'when' condition
  to prevent execution for 'root' or for invalid home directories.
  This directly addresses the user's request and provides multiple
  layers of protection against the 'chown failed' error.

roles/tmux/tasks/main.yml

@@ -21,14 +21,18 @@
     - item.value[0] != 'root'
     - item.value[4] is defined
     - item.value[4] != '/'
+    - item.value[4] != ''
 
 - name: Display the list of collected home directories
   ansible.builtin.debug:
     var: user_home_dirs
 
-- name: Tmux config Play
-  include_tasks: tmux_config.yml
-  loop: "{{ user_home_dirs }}" 
+- name: Tmux config block
+  block:
+    - name: Tmux config Play
+      include_tasks: tmux_config.yml
+      loop: "{{ user_home_dirs }}"
+      when: item | basename != 'root' and item != '/' and item != '' 
 
 # ========================================================================
 # EXAMPLE: Here is how you can reuse the 'user_home_dirs' list