No error message when adding a maintainer on a non existent company

Added maintainers to CoHDI project
https://maintainer-d.cncf.io/projects/248

Assumed Fujitsu already exits (Copy / pasted in the company field) got no errors.
Saved the maintainer.

After adding all maintainers, double checked and found missing maintainers that I have added.
After trying a few things, discovered that the "missing maintainers" companies is not in the DB.

When added with companies as new entries the maintainers where added successfully.

- Issue:
- The maintainer adding fail quietly - now error about compony not existing, no error message that maintainer was not added.
- Audit logs only reflect "adding company" and do not reflect new maintainers add or failure of adding maintainers. - Added 8 maintainers, not in the audit logs.