Return a child with the specified component id (or facetName) from the specified component. If not found, return null. facetName or id may be null to avoid searching the facet Map or the parent's children.
This method will NOT create a new UIComponent.
UIComponent to be searched
@param id id to search for
@param facetName Facet name to search for
@return The child UIComponent if it exists, null otherwise.
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