Display multiple unique customers from the task(without projects' customer), separated by a comma in to_csv.
Display multiple unique customers from the task(without projects' customer), separated by a comma in to_csv.

rafaspinola/jobsworth,ari/jobsworth,digitalnatives/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth,ari/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,digitalnatives/jobsworth,ari/jobsworth,rafaspinola/jobsworth,rafaspinola/jobsworth,webstream-io/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth,xuewenfei/jobsworth,ari/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth,webstream-io/jobsworth,xuewenfei/jobsworth