By Daniel Chavkin Dallas is interested in adding the veteran wide receiver after failing to acquire a wideout prior to the trade deadline. View the original article to see embedded media. The Cowboys didn’t end up making a significant move prior to the trade deadline on Tuesday, but that doesn’t mean they aren’t actively trying to upgrade their roster. NFL Network’s Ian Rapoport reports Dallas has legitimate interest in signing free agent wide receiver Odell Beckham Jr. whenever the veteran decides he is ready to sign with a team. The Cowboys are among several teams that could make an offer to…