Fix: handle routes without path segments

[PatrickSchnoop]

Protect lazy loaded routes without path segments with canLoad-Guard.

PR Checklist

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• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Adding Tests
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation changes
• [ ] Other... Please describe:

What is the current behavior?

If you want to protect a route without any path segments with a canLoad-Guard, an exception is thrown.

const routes = [{
 path: '',
 canLoad: [ OktaAuthGuard ],
 ...
}]

Issue Number: N/A

What is the new behavior?

Routes without path segments can be protected with a canLoad-Guard.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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