Use an empty form when
Checking out a view with minimal side effects.
Synchronizing data from Active Sync resources and during Load from File. Deployers typically create a customized input form for data synchronization. Identity Manager performs all attribute translations in that input form, and no further form processing is needed. However, because the operation requires an administrative context, and all administrators must use a form, you should assign the administrator’s form to an empty form to prevent further, unnecessary form processing being done on the target view.
Implementing a custom workflow that performs a particular action against a User view but which must avoid any other unforeseen side effects. In those custom workflows, it is common to specify an empty form during the checkout view process.