Setting the Missing Value Approach
In the Properties view, you can specify an execution behavior for a decision tree, if parameter elements that are used by condition nodes are missing at runtime.
The following missing value approaches are available:
Null resolves to false. (Default.) The decision tree is executed. When a condition is checked, it evaluates to false if the referenced parameter element is missing. The execution then continues.
Null value. Referenced parameter elements for conditions are checked before execution. If a referenced parameter element is missing, the decision tree is not executed.
Default value. You can specify a default value that is evaluated substitutionally if a referenced parameter element for a condition is missing. For more information about how to specify a default value for a condition node, see
Setting a Default Value for Missing Values.
To set a missing value approach in the Properties view:
2. Click the white background or the root node in the editor.
3. In the Properties view, select Null resolves to false, Null value or Default value from the drop down list in the Missing Value Approach field.
Note:
The Properties view displays information about assets that are currently selected in the editor or in any of the views. If you switch the focus from the asset, the displayed information in the Properties view changes accordingly.