Update StaticCrawlObserver.php

Author: markvaneijk

src/Crawler/StaticCrawlObserver.php

@@ -32,7 +32,7 @@ public function crawled(
         UriInterface $url,
         ResponseInterface $response,
         UriInterface $foundOnUrl = null,
-        ?string $linkText
+        ?string $linkText = null
     ): void {
         $this->components->info('Crawled and cached url: '.$url);
     }
@@ -44,7 +44,7 @@ public function crawlFailed(
         UriInterface $url,
         RequestException $requestException,
         UriInterface $foundOnUrl = null,
-        ?string $linkText
+        ?string $linkText = null
     ): void {
         $this->components->error('Failed to crawl url: '.$url);
     }