fix error when update task : undefined local variable or method 'due'
fix error when update task : undefined local variable or method 'due'

xuewenfei/jobsworth,rafaspinola/jobsworth,ari/jobsworth,arunagw/clockingit,digitalnatives/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth,digitalnatives/jobsworth,rafaspinola/jobsworth,evinoca/clockingit,digitalnatives/jobsworth,evinoca/clockingit,evinoca/clockingit,digitalnatives/jobsworth,arunagw/clockingit,webstream-io/jobsworth,arunagw/clockingit,webstream-io/jobsworth,xuewenfei/jobsworth,ari/jobsworth,ari/jobsworth,xuewenfei/jobsworth,xuewenfei/jobsworth,digitalnatives/jobsworth,evinoca/clockingit,ari/jobsworth,webstream-io/jobsworth,rafaspinola/jobsworth