Surface nonexistent model error in JSON-LD importer #11454

[jacobtylerwalls]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Description of Change

When uploading a JSON-LD zip referencing a graph that does not exist, the error was no longer surfaced to the user. Now this is fixed.

Issues Solved

Closes #11454

Checklist

• I targeted one of these branches:
  • dev/7.6.x (under development): features, bugfixes not covered below
  • dev/7.5.x (main support): regressions, crashing bugs, security issues, major bugs in new features
  • dev/6.2.x (extended support): major security issues, data loss issues
• [n/a -- unreleased] I added a changelog in arches/releases
• [n/a] I submitted a PR to arches-docs (if appropriate)
• Unit tests pass locally with my changes
• I added tests that prove my fix is effective or that my feature works
• My test fails on the target branch

Ticket Background

• Sponsored by: Farallon

[apeters]

this fixes the issue