By Michael Shapiro Dallas could be without a key piece for significant time as it battles for playoff positioning in the Western Conference. View the original article to see embedded media. Mavericks forward Tim Hardaway Jr. suffered a fracture in his left foot in Tuesday’s loss to the Warriors. Hardaway was ruled out for the game by Dallas shortly after landing awkwardly on a layup attempt in the second quarter. No timetable has been given for his return as of Wednesday morning. Hardaway, 29, is in his ninth NBA season and his fourth in Dallas. His scoring and shooting numbers have taken a di…