This will return a category for the given category path.
@param tagName the name of the tag to get. If the tag to get is within a hierarchy of tag nodes, specify the full path to the tag node of interest (e.g. if you want to get back 'child-tag', use "parent-tag/child-tag")
@return a TagItem object encapsulating the node for the tag in therepository
@throws RulesRepositoryException
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