simplify marc21 test
fix whitespace
Making the MARC decoder a little more robust, now empty tags are skipped
merging changes of Chris Cormack (Making the MARC decoder a little more
robust, now empty tags are skipped)
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Adding support for skipping empty (sub)fields in the Exporter
Extending skipping empty (sub)fields to include undef and fields
containing only spaces or an empty string
Adding more documentation to he inline marc
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