Fix issue when option isn't passed

[davidjamesstone]

Proposed change

When viewContext isn't provided, it defaults to undefined but exists as a key.
This change checks viewContext is callable.

I'll create a separate ticket to validate plugin options with joi, like all good hapi plugins do

Azure DevOps work item:

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• [] You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[alexluckett]

I'll create a separate ticket to validate plugin options with joi, like all good hapi plugins do

I was thinking the same thing today while I tried migrating FCP over. Would be handy.