Make this conditional on whether or not we're cloning any repos.

playbooks/roles/git_clone/tasks/main.yml

@@ -23,7 +23,8 @@
 - name: Set git fetch.prune to ignore deleted remote refs
   shell: git config --global fetch.prune true
   become_user: "{{ repo_owner }}"
-  when: repo_owner is defined
+  no_log: true
+  when: repo_owner is defined and GIT_REPOS|length > 0
   tags:
     - install
     - install:code