fix: Fix for the crash when encountering WMF images in pptx and docx

[maxmnemonic]

PIL supports WMF images only on Windows platform, hence this fix

Issue resolved by this Pull Request:
Resolves #594

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

[mergify]

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[dolfim-ibm]

The fix looks good, but can you please add the following in docs/faq.md? (or similar)

??? Some images are missing from MS Word and Powerpoint"

    ### Some images are missing from MS Word and Powerpoint

    The image processing library used by Docling is able to handle WMF images only on Windows platform.
    If you are on other operaring systems, these images will be ignored.

[maxmnemonic]

The fix looks good, but can you please add the following in docs/faq.md? (or similar)

??? Some images are missing from MS Word and Powerpoint"

    ### Some images are missing from MS Word and Powerpoint

    The image processing library used by Docling is able to handle WMF images only on Windows platform.
    If you are on other operaring systems, these images will be ignored.

That's a cool idea, added to faq.md!