fix(rollback) required_if and exclude_if validation

i think you do not want to return early in these cases as @driesvints changed in this PR: laravel#37128
that PR broke using this validation for `null` values (e.g. checkboxes that are not checked) so you cannot use it like `exclude_if,otherfield,null`

src/Illuminate/Validation/Concerns/ValidatesAttributes.php

@@ -1509,10 +1509,6 @@ public function validateRequiredIf($attribute, $value, $parameters)
     {
         $this->requireParameterCount(2, $parameters, 'required_if');
 
-        if (! Arr::has($this->data, $parameters[0])) {
-            return true;
-        }
-
         [$values, $other] = $this->parseDependentRuleParameters($parameters);
 
         if (in_array($other, $values, is_bool($other) || is_null($other))) {
@@ -1612,10 +1608,6 @@ public function validateExcludeIf($attribute, $value, $parameters)
     {
         $this->requireParameterCount(2, $parameters, 'exclude_if');
 
-        if (! Arr::has($this->data, $parameters[0])) {
-            return true;
-        }
-
         [$values, $other] = $this->parseDependentRuleParameters($parameters);
 
         return ! in_array($other, $values, is_bool($other) || is_null($other));