Allow null value

src/Sanitizer.php

@@ -58,8 +58,13 @@ public static function create(array $config): SanitizerInterface
  return SanitizerBuilder::createDefault()->build($config);
  }
 
- public function sanitize(string $html): string
+ public function sanitize(?string $html = null): ?string
  {
+ if(!$html)
+ {
+ return null;
+ }
+
  $sanitized = $this->doSanitize($html);
 
  if ($this->logger) {

src/SanitizerInterface.php

@@ -20,5 +20,5 @@
  */
 interface SanitizerInterface
 {
- public function sanitize(string $html): string;
+ public function sanitize(?string $html = null): ?string;
 }

tests/SimpleSanitizerTest.php

@@ -24,6 +24,14 @@ public function createSanitizer(): SanitizerInterface
  public function provideFixtures(): array
  {
  return array_merge(parent::provideFixtures(), [
+ /*
+ * Null value
+ */
+ [
+ null,
+ null
+ ]
+
  /*
  * Normal tags
  */