Add method to handle empty receptionEmails in Response

Enhanced the Response model to handle cases where receptionEmails is empty by setting it to a new ReceptionEmails object. Added corresponding XML stub and test case to validate this change.

Fixed a potential issue in TypeArray's count method by providing a default empty array.

src/Models/Response.php

@@ -187,4 +187,13 @@ public function isSuccessful(): bool
     {
         return $this->getStatusCode() === 'Success';
     }
+
+    public function set($key, $value): static
+    {
+        if ($key === 'receptionEmails' && empty($value)) {
+            return parent::set('receptionEmails', new ReceptionEmails());
+        }
+
+        return parent::set($key, $value);
+    }
 }

src/Models/TypeArray.php

@@ -125,7 +125,7 @@ public function offsetUnset($offset): void
 
     public function count(): int
     {
-        return count($this->attributes[$this->childKey]);
+        return count($this->attributes[$this->childKey] ?? []);
     }
 
     /**

stubs/response-doc-with-empty-reception-emails.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ResponseDoc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+    <response>
+        <index>1</index>
+        <invoiceUid>6F825B9B74717280D1F9A38252D0B65604C6D162</invoiceUid>
+        <invoiceMark>480301204040191</invoiceMark>
+        <qrUrl>https://mydataapidev.aade.gr/TimologioQR/QRInfo?q=sSsxThUx5i3O8ankrp8XUDiL0q12vbzuWZP0nEfMgAyQ2nbm7s6vSz3CYYcmod6i0uCrPCvSLrQ5N1qxEHF8JsfMNz6NmibNhBNXJiR8ecC%3d</qrUrl>
+        <statusCode>Success</statusCode>
+        <receptionEmails/>
+    </response>
+</ResponseDoc>

tests/ResponseTest.php

@@ -26,6 +26,21 @@ public function test_it_reads_response_correctly()
         $this->assertEquals("[email protected]", $doc[0]->getReceptionEmails()->offsetGet(1));
     }
 
+    public function test_it_reads_response_with_empty_reception_emails_correctly()
+    {
+        $doc = $this->getResponseDocFromXml('response-doc-with-empty-reception-emails');
+
+        $this->assertCount(1, $doc);
+        $this->assertEquals(1, $doc[0]->getIndex());
+        $this->assertEquals("6F825B9B74717280D1F9A38252D0B65604C6D162", $doc[0]->getInvoiceUid());
+        $this->assertEquals("480301204040191", $doc[0]->getInvoiceMark());
+        $this->assertEquals("https://mydataapidev.aade.gr/TimologioQR/QRInfo?q=sSsxThUx5i3O8ankrp8XUDiL0q12vbzuWZP0nEfMgAyQ2nbm7s6vSz3CYYcmod6i0uCrPCvSLrQ5N1qxEHF8JsfMNz6NmibNhBNXJiR8ecC%3d", $doc[0]->getQrUrl());
+        $this->assertEquals("Success", $doc[0]->getStatusCode());
+
+        $this->assertIsArray($doc[0]->getReceptionEmails()->all());
+        $this->assertCount(0, $doc[0]->getReceptionEmails());
+    }
+
     public function test_it_reads_errors_correctly()
     {
         $doc = $this->getResponseDocFromXml('response-doc-with-errors');