Can't update EPerson information if metadata is completely missing #4287
Description
Describe the bug
When editing the profile of an EPerson, if any of the metadata is missing, is impossible to add it from the UI.
To Reproduce
To reproduce this issue we need some corrupted data for an EPerson, this can be done either by deleting one of the metadata directly on the DB or via AIP import, deleting one tag e.g. LastName (https://wiki.lyrasis.org/display/DSDOC8x/AIP+Backup+and+Restore)
After having created this corrupted EPerson we need to:
1- access as admin and navigate to /access-control/epeople
2- edit the EPerson with the missing metadata
3 - add the missing metadata and save the form
We can observe that even if we are notified with a success the metadata has not been added.
Expected behavior
It should be possible to add a missing metadata for an EPerson.