Use null instead of 'null' in null objects schema

Signed-off-by: Miguel A. Cabrera Minagorri mcabrera@vmware.com

Description of the change

Null objects were being set as "null" (note string) instead of null into the schema. This PR fixes that and sets it properly.

Benefits

Possible drawbacks

Applicable issues

Additional information

Checklist

[x] Version bumped in package.json and package-lock.json according to semver.
[x] New features are documented in the README.md
[x] New features contain a new test at the tests folder
[x] All tests pass running npm test

bitnami / readme-generator-for-helm