Remove quiet so that we don't get a rake aborted message here.

playbooks/roles/edxapp/tasks/deploy.yml

@@ -31,7 +31,7 @@
 
 # This checks needs to be run to see if rake can be used but its failure should not stop the run.
 - name: check if rake gather_assets is available
-  shell: executable=/bin/bash chdir={{ platform_code_dir }} rake -T | grep --quiet gather_assets
+  shell: executable=/bin/bash chdir={{ platform_code_dir }} rake -T | grep gather_assets
   environment: "{{ deploy_environment }}"
   register: grep_gather_assets 
   ignore_errors: yes