Fix HIBC parser: handle empty segments and relax UnitOfMeasure valida…

[neemevool]

Description

Fixes issues with HIBC barcode parsing:

1. Added null/whitespace check after stripping symbology identifier
2. Added length check before accessing segmentData.First() to prevent IndexOutOfRangeException
3. Commented out strict UnitOfMeasure validation for /Q segment (was causing false positives). The HIBC 2.3.2.4 is not so strict (should, not shall) as the current code is. I causes issues parsing even major vendors barcodes like 3M

Changes

• ParseString(): Added validation after symbology identifier stripping
• Case 'Q': Relaxed UnitOfMeasure requirement
• Case '$': Added length validation before accessing characters

Testing

Tested with additional case and removed the test which intent was to trigger the exception

[DacoTaco]

lgtm

[DacoTaco]

version 0.1.9 has been pushed to nuget and is being processed @neemevool :)