Get ModifyUtility for the current operation by given utility type.
"setup_var" is a variable referencing a Setup object. | 
        
"setup_var" is a variable referencing a Setup object. | 
        
| Type | Description | 
| ModifyUtility | Returns ModifyUtility for specific type or null if the type is not compatible with the operation. | 
| Name | Type | Description | 
| utility | ModifyUtilityTypes | Defines the specific ModifyUtility. |