Hide "Save" button if view is empty

This removes all actions associated with a view, which may remove buttons provided by other (contrib/custom) modules that are still useful when there are no results. I don't know of any, but implementing this would be a case of the module reaching beyond the boundaries of its own logic.

I suggest that instead we open a core issue requesting that this part of ViewsFormMainForm::buildForm pays attention to a return value to determine if a form is actually required in the circumstances:

      // If the field provides a views form, allow it to modify the $form array.
      $has_form = FALSE;
      if (method_exists($field, 'viewsForm')) {
        $field->viewsForm($form, $form_state);
        $has_form = TRUE;
      }

Thoughts?

Agree with #4. The #access=FALSE should only apply on the button from weight module.