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Defines effects that are applied when action output is empty. You can add optional control flows to determine if effects happen.

Example

action (SelectItem) {
  type (Search)
  collect {
    input (searchTerm) {
      type (SearchTerm)
      min (Optional)
    }
    input (order) {
      description (order that is being updated)
      type (Order)
      min (Required)
      hidden
    }
    computed-input (items) {
      description (The items to select from, should be more than one)
      type (Item)
      min (Optional) //this is optional as the shopping cart may be empty
      max (Many)
      compute {
        if (exists(order.items)) {
          intent {
            goal: Item
            value: $expr(order.items)
          }
        }
      }
    }
  }
  output (SelectedItem) {
    throws {

      error(MultipleMatches) {
        property (matches) {
          type (Item)
          max (Many)
        }
        on-catch {
          //prompt for matched items, clear searchTerm
          prompt (items) {
            required-value (true)
            single-value (true)
            candidates (matches)
          }
        }
      }
    }
    on-empty {
      //prompt for items, clear searchTerm
      ordered-effects {
        drop (searchTerm)
        prompt (items) {
          required-value (true)
          single-value (true)
          candidates (items)
        }
      }
    } 
  }
}

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