Bug 9620: IncludeSeeFromInSearches and data in $9 subfields can break indexing

Bug 9620: IncludeSeeFromInSearches and data in $9 subfields can break indexing

In Germany 020$9 is used to store the ISBN with hyphens. In rare cases this
can break indexing in combination with IncludeSeeFromInSearches.

To reproduce:
1) Change your frameworks:
  * Make sure 084 $a is visible
  * Create a 084 $9 that you link to PERSO_NAME authorities.
2) Create a record or edit an existing one:
  * Use the plugin on 084 to link the record to an authority.
  * Make sure 400 is filled in your authority record.

Preparations all done, now test indexing:

3) Make sure IncludeSeeFromInSearches is OFF
  * Reindexing should work without any problems.

4) Activate IncludeSeeFromInSearches
  * Reindexing should throw an error and stop:
    201.Subfields are only for data fields (generally,
    just tags >= 010 at /home/koha/Koha/Filter/MARC/EmbedSee
    FromHeadings.pm line 94

5) Apply patch and reindex.
  * No error should occur.
  * Test 4xx fields from other tags were properly indexed.

What causes the problem is the fact, that Koha tries to store
the date from the 400 in the bibliographic record for indexing.
For this it calculates a tag in the bibliographic record from the
tag it found the authority link in and the 4xx tags used in the
authority record. If you have an authority linked to a 0xx field
and the matching authority has a 4xx where xx < 10, the calculated
tag will be a control field. The attempt to add subfields to this
control field, is causing the error and breaks the indexing process.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Work as described, and is a long description :)
Test:
1) Enabled 084 (all subfields visible), added 084_9 (missing from
default framework) linked to PERSO_NAME
2) Edited authority record and added some data to 400
3) Edited bib record, linked 084 to previous auth record
4) With IncludeSeeFromInSearches OFF, re-index without problem
5) With IncludeSeeFromInSearches ON, re-index problems!!!
====================
exporting biblio
====================
1...Subfields are only for data fields (generally, just tags >= 010) at...
Abort
6) Applied patch
7) With IncludeSeeFromInSearches ON, re-index without problem
...
====================
5001....................................................................................................
Records exported: 5060
====================
...
====================
2001....................................................................................................
Records exported: 2024
====================
CLEANING
====================
Good!

*) That's "works as described", don't know if other tests are needed.

No errors from koha-qa

Signed-off-by: Elliott Davis <elliott@bywatersolions.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>