The word 'false' is saved in empty text repeater fields in v2.4.0 #1138

This issue affects v2.4.0 but not v2.3.0

When adding new items to a repeater text field and leaving them blank, the items should not be saved. In v2.4.0 the items are saved and contain the word false. This means when displaying the field values on the front end, the word false is returned and displayed.

To reproduce:

• Create a field with 'type' => 'text' and 'repeatable' => true
• Add an item to the field with a value in it
• Add a second item with no value
• Save the post
• The second item will contain the word false