Creates a new tag with the provided label if a tag with the same label doesn't already exist.
This method may require higher-level permissions than the caller has, based on their identity and roles and permissions. In these cases, you can ensure the method is called with the required level of authorization by using one of the following:
Tag label. The label for each tag in a blog must be unique.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.