Overview: When importing a record with a 100 tag that does not have a $a, the record is being discarded with an error.

Current workaround:

Steps to Reproduce:

1. Log into FOLIO-snapshot as diku_admin

2. Use the Default - Create instance and SRS import profile.

3. Import any marc record that has a 100 tag but no $a, e.g., 100 
   $4aut.

4. Etc

Expected Results: The record creates without mapping the 100 tag to the contributor field.

Actual Results: The record is discarded by the import and the following error message is provided.

io.vertx.core.impl.NoStackTraceThrowable: {"errors":[{"message":"must not be null","type":"1","code":"javax.validation.constraints.NotNull.message","parameters":[

{"key":"contributors[0].name","value":"null"}

]}]}

Additional Information: See data import lab session recording from 10/5/2023.

Interested parties:  

BE notes:
1. apply 

for fields that need to contain a value for Contributors to be added for the mapped entity. See details https://github.com/folio-org/mod-source-record-manager/blob/master/RuleProcessorApi.md#required-sub-fields

2. Consider adding test in data-import-processing-core

3. Script to update rules will be added in scope of MODSOURMAN-1086

, Please finalize list of fields and subfields to contain this "required" condition - 100, 110, 111, 700, 710, 711, 720? Should we add it for 245 field as well?