This patch fixes several warnings that occur when running Edifact tests:
1. Changed `my $self = ()` to `my $self = {}` in Koha::Edifact constructor
to properly initialize as hashref instead of empty list
2. Added null/empty checks in Koha::Edifact::Segment::_parse_seg() to prevent
warnings when processing undefined or empty segments
3. Added null/empty checks in Koha::Edifact::Segment::_get_elements() to
handle undefined segments gracefully
4. Added Test::NoWarnings to t/Edifact.t to catch any remaining warnings
These changes eliminate "Use of uninitialized value" warnings and ensure
clean test runs without affecting EDI functionality.
Test plan:
1. Run prove t/Edifact.t and verify no warnings are displayed
2. Test EDI message processing to ensure no regression
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
ac266cad8b