A judge should not have allowed jurors to hear evidence during a negligence trial that a man who sustained injuries while cutting down a tree did so without a hard hat, a federal appeals court ruled.The 7th U.S. Circuit Court of Appeals decision issued May 3 reversed the verdict and called for a new trial in the case brought by Johnny Webber.“The fact that Webber was not wearing a hard hat did not cause the tree branch to fall and hit him,” Judge David F. Hamilton wrote.In April 2014, Webber helped his friend …