public void setType(Vertex v, String type) {
		if (this.contains(v)) {

			//try
			//{
			vertexType.setValue(v, type);
			/*}
			catch( NoValueException exc )
			{
			}*/
		}
	}
Whitens the children of v.  It is only called after v has no more
 children left and we have backtracked to the calling parent of
 v.  This is to ensure that we don't miss out on any paths that
 contain a child of v which has other parents.
Ghidra/Framework/Generic/src/main/java/ghidra/util/graph/Dominator.java