Plaintiffs in a proposed class action lawsuit can proceed with claims that Kraft failed to disclose the potential inclusion of a hazardous chemical in its famous macaroni and cheese, a federal judge ruled Thursday.U.S. District Judge Rebecca R. Pallmeyer of the Northern District of Illinois ruled that the plaintiffs’ failure-to-disclose and unjust enrichment claims can continue. But she rejected their claims that Kraft misled consumers by advertising unrelated alleged positive qualities of the product.The plaintiffs, …