I wish there was a special group named something like "CatchError" to catch error (i.e. like in datareader) and handle gracefully errors with a message box for instance

Currently, users are left on their own to figure which step crash (since you have no way to handle error, you most likely will run the remain step anyway.
Would be nice to have a new process step or option in show message to show "Error" and step number in the procedure.
This would be a big help for developer, functional administrator and end-user!