Stanford's provided some records with invalid UTF-8 characters in it (and, an empty subfield key...).
Backtrace
line 42 of [PROJECT_ROOT]/app/services/marc_record_service.rb: block in each
line 100 of [PROJECT_ROOT]/app/services/marc_record_service.rb: block in with_reader
line 99 of [PROJECT_ROOT]/app/services/marc_record_service.rb: with_reader
Stanford's provided some records with invalid UTF-8 characters in it (and, an empty subfield key...).
Backtrace
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