Merge pull request #9 from kmoconnect/fix-null-return-getFileUrl

Update PdfViewerEntry.php

src/Infolists/Components/PdfViewerEntry.php

@@ -53,7 +53,7 @@ public function fileUrl(string|Closure $fileUrl): self
         return $this;
     }
 
-    public function getFileUrl(?string $state = null): string
+    public function getFileUrl(?string $state = null): string|null
     {
         if (empty($state)) {
             return $this->evaluate($this->fileUrl);