Fix: Handle exceptions in Retrieve and update test usage

Co-authored-by: zembrowski <zembrowski@rechtlogisch.de>

Author: cursoragent

src/Retrieve.php

@@ -88,7 +88,13 @@ public function page(int $no = 1): void
                 $this->retrieved[$tseId] = $rowData;
             });
         } catch (Throwable $e) {
-            $html = $this->browser->getResponse()->getContent();
+            $html = null;
+            try {
+                $html = $this->browser->getResponse()->getContent();
+            } catch (Throwable) {
+                // No response available (request failed before completion)
+                // This is expected when the initial request() call fails
+            }
             throw (new RetrieveException($e->getMessage(), $e->getCode(), $e->getPrevious()))
                 ->addContext($url, $html);
         }

tests/ExternalTest.php

@@ -2,12 +2,12 @@
 
 use Rechtlogisch\TseId\Retrieve;
 
-$retrieve = (function () {
+$retrieve = function () {
     return new Retrieve;
-})();
+};
 
 it('retrieve data from BSI website', function () use (&$retrieve) {
-    $list = $retrieve->list();
+    $list = $retrieve()->list();
     expect($list)
         ->toBeArray()
         ->not->toBeEmpty()