Add Xls to Sample 25

samples/Basic2/25_In_memory_image.php

@@ -101,7 +101,7 @@ $drawing->setCoordinates('C5');
 $helper->write(
     $spreadsheet,
     __FILE__,
-    ['Xlsx', 'Html', 'Ods'],
+    ['Xlsx', 'Html', 'Ods', 'Xls'],
     false,
     function (BaseWriter $writer): void {
         if (method_exists($writer, 'writeAllSheets')) {

src/PhpSpreadsheet/Writer/Xls/Worksheet.php

@@ -484,6 +484,9 @@ class Worksheet extends BIFFwriter
             [$column, $row] = Coordinate::indexesFromString($coordinate);
 
             $url = $hyperlink->getUrl();
+            if ($url === '') {
+                continue;
+            }
             if ($url[0] === '#') {
                 $url = "internal:$url";
             } elseif (str_starts_with($url, 'sheet://')) {