Minor fixes around parse_url() checks

Author: nicolas-grekas

AbstractUriElement.php

@@ -46,7 +46,7 @@ public function __construct(\DOMElement $node, ?string $currentUri = null, ?stri
         $this->method = $method ? strtoupper($method) : null;
         $this->currentUri = $currentUri;
 
-        $elementUriIsRelative = null === parse_url(trim($this->getRawUri()), \PHP_URL_SCHEME);
+        $elementUriIsRelative = !parse_url(trim($this->getRawUri()), \PHP_URL_SCHEME);
         $baseUriIsAbsolute = null !== $this->currentUri && \in_array(strtolower(substr($this->currentUri, 0, 4)), ['http', 'file']);
         if ($elementUriIsRelative && !$baseUriIsAbsolute) {
             throw new \InvalidArgumentException(sprintf('The URL of the element is relative, so you must define its base URI passing an absolute URL to the constructor of the "%s" class ("%s" was passed).', __CLASS__, $this->currentUri));

Form.php

@@ -203,9 +203,8 @@ public function getUri()
         $uri = parent::getUri();
 
         if (!\in_array($this->getMethod(), ['POST', 'PUT', 'DELETE', 'PATCH'])) {
-            $query = parse_url($uri, \PHP_URL_QUERY);
             $currentParameters = [];
-            if ($query) {
+            if ($query = parse_url($uri, \PHP_URL_QUERY)) {
                 parse_str($query, $currentParameters);
             }