setting default cert identity file to !!null

playbooks/roles/certs/defaults/main.yml

@@ -28,7 +28,7 @@ CERTS_KEY_ID: "FEF8D954"
 # Path to git identity file for pull access to
 # the edX certificates repo - REQUIRED
 # Example - {{ secure_dir }}/files/git-identity
-CERTS_LOCAL_GIT_IDENTITY: ""
+CERTS_LOCAL_GIT_IDENTITY: !!null
 # Path to public and private gpg key for signing
 # the edX certificate. Default is a dummy key
 CERTS_LOCAL_PRIVATE_KEY: "example-private-key.txt"

playbooks/roles/certs/tasks/main.yml

@@ -33,7 +33,7 @@
 #
 - name: Checking to see if git identity is set
   fail: msg="You must set CERTS_LOCAL_GIT_IDENTITY var for this role!"
-  when: CERTS_LOCAL_GIT_IDENTITY == ""
+  when: not CERTS_LOCAL_GIT_IDENTITY
 
 - name: certs | create application user
   user: >