Fix TypeError on null path variable

[youssame]

Description

I check if the path is null or empty when the user hasn't set the action property or has left it empty.

Corresponding issue: #2963

Testing

I added two tests that check if everything is OK in two cases (action is unset or is empty)

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded

[1cg]

Thank you!