getRenditionByName(node, renditionName) retrieves existing
renditions for a node by rendition name.
Parameters
- node
- The source nodes for the renditions.
- renditionName
- The name used to identify a rendition. For example cm:doclib or {http://www.alfresco.org/model/content/1.0}imgpreview.
Returns
Returns a ScriptNode which represents the parent association for the rendition or null if there is no such rendition.