Fix rsyslog_client_log_dir to be optional

Fix the regression introduced in
I371d0bbbd1f9dfa893df054471f17f5cc4b640df which causes
the role to fail if a log directory is not provided.

Change-Id: Iba17bed79e26e6e7eb2300d413058145ec680d87

defaults/main.yml

@@ -26,6 +26,7 @@ rsyslog_client_spool_directory: /var/spool/rsyslog
 # discovery process. This will force the logs from a given directory
 # to be shipped using rsyslog.
 # rsyslog_client_log_dir: /var/log/project
+rsyslog_client_log_dir: false
 
 # Set the `rsyslog_client_log_files` variable in list format to skip
 # log discovery all together and ship only log files that are explicitly

tasks/rsyslog_client_post_install.yml

@@ -29,6 +29,8 @@
 - name: Check if log dir exists
   stat:
     path: "{{ rsyslog_client_log_dir }}"
+  when:
+    - "{{ rsyslog_client_log_dir | bool }}"
   register: log_dir
 
 - name: Find all log files
@@ -37,7 +39,7 @@
   register: log_files
   changed_when: false
   when:
-    - rsyslog_client_log_dir is defined
+    - not log_dir | skipped
     - log_dir.stat.isdir is defined and log_dir.stat.isdir
   tags:
     # do not trigger ANSIBLE0013 as shell is indeed needed here