Handle errors with Try / Catch

Carry on, retry or record a reason when a step fails.

1. 1

   Put the risky steps on Try's body; the steps on its catch arrow run only when one of them fails.

2. 2

   Finally runs either way, e.g. to close a tab.

3. 3

   Each step also has On error: fail the row, skip the row or carry on.