Fix obsidian role when already using flatpak

roles/obsidian/tasks/Linux.yaml

@@ -1,10 +1,10 @@
 ---
-# TODO: Prefer Flatpak over AppImage if available
 - name: install flatpak package
   flatpak:
     name: md.obsidian.Obsidian
 
-- name: stat symlink
+# Remove old appimage if it exists
+- name: stat appimage symlink
   stat:
     path: '{{ansible_env.HOME}}/.local/bin/Obsidian'
   register: symlink_file
@@ -19,6 +19,7 @@
     dest: '{{ansible_env.HOME}}/.local/share/applications/obsidian-obsidian.desktop'
     state: absent
 - name: remove old appimage
+  when: "'lnk_source' in symlink_file.stat"
   file:
     path: '{{symlink_file.stat.lnk_source}}'
     state: absent