Avoid unnecessary null pointer exception if reference schema is given

[laurisvan]

Ultimate problem:

When running an application using json_schema with debugger, I tend to break on every exception. The json_schema initialization unnecessarily tried to parse the contents of _fetchedFromUri, which throws when this value is null.

How it was fixed:

I added an extra null check to avoid JsonSchemaUtils.getBaseFromFullUri call when the parameter is not given.

Testing suggestions:

Potential areas of regression:

None identified.

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[joecotton-wk]

@Workiva/release-management-p