Translating a document with minification fails if the original file has no media #73

Problem/Motivation

Deepl support document minification: Deepl document minification: https://github.com/DeepLcom/deepl-php?tab=readme-ov-file#document-minification

However, translating a .docx or .pptx file currently results in an exception when the input file has no media

Steps to reproduce

1. Create a docx with a single word 'test'
2. Call \DeepL\Translator::translateDocument with $options[TranslateDocumentOptions::ENABLE_DOCUMENT_MINIFICATION]
3. Notice the call results in an exception:
   UnexpectedValueException: RecursiveDirectoryIterator::__construct(/var/folders/7c/83djllx9041g_r31cy6w3w280000gn/T/document_minification_693ae127272c6/original_media): Failed to open directory: No such file or directory in RecursiveDirectoryIterator->__construct() (line 309 of vendor/deeplcom/deepl-php/src/DocumentMinifier.php). DeepL\DocumentMinifier->replaceImagesInDir('/var/folders/7c/83djllx9041g_r31cy6w3w280000gn/T/document_minification_693ae127272c6/extracted_doc', '/var/folders/7c/83djllx9041g_r31cy6w3w280000gn/T/document_minification_693ae127272c6/original_media') (Line: 205)

Proposed resolution

Check if the original media directory is available

User interface changes

None

API changes

None

Data model changes

None