code: def get_tree_from_branch(self, ref):
          '''
          Return a pygit2.Tree object matching a head ref fetched into
          refs/remotes/origin/
          '''
          try:
              return self.peel(self.repo.lookup_reference(
                  'refs/remotes/origin/{0}'.format(ref))).tree
          except KeyError:
              return Nonf get_tree_from_branch(self, ref):
          '''
          Return a pygit2.Tree object matching a head ref fetched into
          refs/remotes/origin/
          '''
          try:
              return self.peel(self.repo.lookup_reference(
                  'refs/remotes/origin/{0}'.format(ref))).tree
          except KeyError:
              return None
docs: Return a pygit2.Tree object matching a head ref fetched into
          refs/remotes/origin/