When using the form.checkbox ViewHelper in ObjectAccessorMode (bound to a property of the form object) this leads to an error when the form object is NULL (e.g. in the newAction) because the type of the property (array / boolean) can't be determined.
To avoid this issue, we need a new argument "multiple" that will make sure, that "" are appended to the checkbox field name.
[BUGFIX] form.checkbox ViewHelper throws Exception in newAction
This adds an argument "multiple" to the checkbox ViewHelper
which makes it possible to mark the property as multi value
even if the bound object is NULL.
Besides the ViewHelper can now be bound to all scalar properties,
arrays and Traversable objects.
This change is backwards-compatible.