Getting Validation error even when no view mode is selected for a field

1. issue 1: class "field-visibility-identifier" to manage visibility of fields but class "field-visibility-identifier" is being added even when no view mode is selected in View Mode Conditional Fields Settings. Now class "field-visibility-identifier" is added only when view mode is selected to a field.
2. issue 2: when we are editing a required field in a content type which doesnt have any view modes selected, we are getting below issue "Required and View Mode Conditional Fields Settings both cant work together."

Above two issue are fixed in patch.
please review.

Applied the patch. Thanks for the patch.

Automatically closed - issue fixed for 2 weeks with no activity.