Fix: Ensure PdfForm is returned even when acroForm has no fields

[tungthanh1497]

Summary

This pull request fixes an issue in the PdfDocument.form getter where the form would not be returned if the acroForm existed in the catalog but contained no fields (fields.count == 0).

As a result, _form would remain null, leading to inconsistent behavior or potential null access elsewhere in the code.

What was changed

• Moved the return statement outside the if (_form!.fields.count != 0) condition.
• Ensured _form is always returned once initialized, regardless of the number of fields.

Why is this needed?

In some PDF documents, the acroForm dictionary exists but does not yet have any form fields (e.g., newly created or partially filled forms). Without this fix, attempting to access form would result in a null, which may cause exceptions or unexpected behavior in consumer code.

How to test

• Open a PDF document with an empty acroForm dictionary.
• Call document.form and ensure it returns a valid PdfForm instance, not null.
• Ensure no exceptions are thrown during the access.

[SF2381]

Hi @tungthanh1497 ,

Thank you for the information. We are currently working on this issue and plan to include the fix in our upcoming release, which is expected to be available on April 29, 2025.

With regards,
Anand P