Retrieves a tag with the provided slug.
The slug is the end of a tag's URL that refers to a specific tag.
For example, if a tag's URL is https://example.com/blog/tag/{my-tag-slug},
the slug is my-tag-slug. The slug is case-sensitive and derived from the tag's label.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.