Make JSON import more fault tolerant

What does this MR do and why?

Make JSON import more fault tolerant

• Ensure we have array objects where we expect to be able to iterate

References

• Refs: https://new-sentry.gitlab.net/organizations/gitlab/issues/1583184

Screenshots or screen recordings

How to set up and validate locally

1. Download: framework.json

2. Download: framework_no_req.json

3. Go to to compliance center with ultimate licensed group

4. Got to Frameworks tab

5. Click "New framework"

6. Click "Import framework"

7. Choose downloaded framework.json

8. Observe framework created with two requirements, one missing a control

9. Got to Frameworks tab

10. Click "New framework"

11. Click "Import framework"

12. Choose downloaded framework_no_req.json

13. Observe framework created without requirements, (and thus no controls)

MR acceptance checklist

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