title: Skipping task on failure in Airflow
body: <p>We are creating tasks to load data from GCS to big query based on dativize sequentially. Consider
  task a(03rd June)&gt;&gt;task b(04th June)&gt;&gt;task c(05th June) .
  If task a is failed ,we don't want to put entire flow as failure ,but should skip the failed task and execute the next task.</p>
  <p>Can anyone suggest the approach to follow , as we are newbies it would be great if anyone can guide us</p>