Range form element validation has no effect

[alybarreno]

Describe the bug:
Validation of the "Range" field does not work, no validation or effect message is displayed.

To Reproduce:

1. Create form and add "rank" field
2. Check validation box
3. Publish the form
4. Send the form without filling in the fields
5. Visualize the error

Expected behavior:

The validation of the field must work.
The effect and validation message must be shown.

Screenshots:

[gfirem]

This field needs the JS validation.