https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=43095

            Bug ID: 43095
           Summary: Patron card creator dies on CODE39MOD and CODE39MOD10
                    barcode types (missing Algorithm::CheckDigits import)
   Initiative type: ---
        Sponsorship ---
            status:
           Product: Koha
           Version: Main
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Label/patron card printing
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
  Target Milestone: ---

C4::Patroncards::Patroncard::_draw_barcode() calls CheckDigits('code_39') and
CheckDigits('siret') for the CODE39MOD and CODE39MOD10 barcode types
(Patroncard.pm lines 434 and 437), but the module never imports
Algorithm::CheckDigits.

Compare C4::Labels::Label, which has:

    use Algorithm::CheckDigits qw( CheckDigits );

at line 7. C4::Patroncards::Patroncard has no such line.

Both CheckDigits() calls sit *outside* the internal eval that guards the
PDF::Reuse::Barcode call (the eval begins at line 440), so selecting either
checksum barcode type in a patron card layout dies at runtime:

    Undefined subroutine &C4::Patroncards::Patroncard::CheckDigits called at
C4/Patroncards/Patroncard.pm line 434.

To reproduce: create a patron card layout with barcode type CODE39MOD (or
CODE39MOD10) and print/export a batch, or run the extended
t/db_dependent/Patroncards/t_Patroncard.t from Bug 41719, whose draw_barcode()
subtest exercises all five supported barcode types and fails on these two.

The fix is a one-line import. This was surfaced by the rendering test coverage
work on Bug 41719, which will depend on this bug so its barcode-type coverage
passes.

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