[FIX & TESTS] cleanTags : check if param is undefined. Add 3 test #308
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@pieper, this PR fixes a test failure due to PR #303
Check if a param is passed in function cleanTags. If not, create it and fill with default value.
It maintains backwards compatibility for the API.
Add 3 tests demonstrating the ways to use the method
tagNamesToEmpty
tagNamesToEmpty