Replaced standard http_build_query by guzzle's build_query, which keeps params with no value

module/Core/src/Action/AbstractTrackingAction.php

@@ -20,8 +20,8 @@ use Zend\Diactoros\Uri;
 
 use function array_key_exists;
 use function array_merge;
+use function GuzzleHttp\Psr7\build_query;
 use function GuzzleHttp\Psr7\parse_query;
-use function http_build_query;
 
 abstract class AbstractTrackingAction implements MiddlewareInterface
 {
@@ -46,15 +46,6 @@ abstract class AbstractTrackingAction implements MiddlewareInterface
         $this->logger = $logger ?: new NullLogger();
     }
 
-    /**
-     * Process an incoming server request and return a response, optionally delegating
-     * to the next middleware component to create the response.
-     *
-     * @param ServerRequestInterface $request
-     * @param RequestHandlerInterface $handler
-     *
-     * @return ResponseInterface
-     */
     public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
     {
         $shortCode = $request->getAttribute('shortCode', '');
@@ -86,7 +77,7 @@ abstract class AbstractTrackingAction implements MiddlewareInterface
         }
         $mergedQuery = array_merge($hardcodedQuery, $currentQuery);
 
-        return (string) $uri->withQuery(http_build_query($mergedQuery));
+        return (string) $uri->withQuery(build_query($mergedQuery));
     }
 
     abstract protected function createSuccessResp(string $longUrl): ResponseInterface;

module/Core/test/Action/RedirectActionTest.php

@@ -67,6 +67,7 @@ class RedirectActionTest extends TestCase
     {
         yield ['http://domain.com/foo/bar?some=thing', []];
         yield ['http://domain.com/foo/bar?some=thing', ['foobar' => 'notrack']];
+        yield ['http://domain.com/foo/bar?some=thing&else', ['else' => null]];
         yield ['http://domain.com/foo/bar?some=thing&foo=bar', ['foo' => 'bar']];
         yield ['http://domain.com/foo/bar?some=overwritten&foo=bar', ['foo' => 'bar', 'some' => 'overwritten']];
         yield ['http://domain.com/foo/bar?some=overwritten', ['foobar' => 'notrack', 'some' => 'overwritten']];