Improved code coverage on MenuBuilder

Improved code coverage.

Testing out PR template below (docs/template to come in another PR)

| - Q. - | - A. - |
| ------- | ------- |
| Tickets | JIRA # |
| Type | Tech Debt |
| BC breaks? | no |
| Deprecations? | no |
| Docs | none |
| Build | [![Build Status](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/badges/build.png?b=feature%2Fmenu-code-coverage)](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/build-status/feature/menu-code-coverage) |
| Coverage | [![Code Coverage](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/badges/coverage.png?b=feature%2Fmenu-code-coverage)](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/?branch=feature%2Fmenu-code-coverage) |
| Quality | [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/badges/quality-score.png?b=feature%2Fmenu-code-coverage)](https://scrutinizer-ci.com/g/TransformCore/dial-tone-frontend/?branch=feature%2Fmenu-code-coverage) |