private DataTypeManager findManager(DataTypeManagerService service) {
		return getManagerById(service);
	}
Uses the given service and its {@link DataTypeManager}s to find the data type 
represented by this url

@param service the service
@return the data type; null if there was an error restoring the type, such as if the
        parent {@link DataTypeManager} has been closed
Ghidra/Features/Base/src/main/java/ghidra/app/util/datatype/DataTypeUrl.java