minor #27676 [minor] SCA (kalessil)

This PR was squashed before being merged into the 4.0 branch (closes #27676).

Discussion
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[minor] SCA

| Q             | A
| ------------- | ---
| Branch?       | 4.0>
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Found some leftovers after introducing parameter types in 4.0.

Commits
-------

afeb89fa06 [minor] SCA

Author: fabpot

Loader/Configurator/DefaultsConfigurator.php

@@ -34,12 +34,12 @@ class DefaultsConfigurator extends AbstractServiceConfigurator
      */
     final public function tag(string $name, array $attributes = array())
     {
-        if (!is_string($name) || '' === $name) {
+        if ('' === $name) {
             throw new InvalidArgumentException('The tag name in "_defaults" must be a non-empty string.');
         }
 
         foreach ($attributes as $attribute => $value) {
-            if (!is_scalar($value) && null !== $value) {
+            if (null !== $value && !is_scalar($value)) {
                 throw new InvalidArgumentException(sprintf('Tag "%s", attribute "%s" in "_defaults" must be of a scalar-type.', $name, $attribute));
             }
         }