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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_missing_trees(self, path, root_tree):
 """ Creates missing ``Tree`` objects for the given path. :param path: path given as a string. It may be a path to a file node (i.e. ``foo/bar/baz.txt``) or directory path - in that case it must end with slash (i.e. ``foo/bar/``). :param root_tree: ``dulwich.objects.Tree`` object from which we start traversing (should be commit's root tree) """

        dirpath = posixpath.split(path)[0]
        dirs = dirpath.split('/')
        if not dirs or dirs == ['']:
            return []

        def get_tree_for_dir(tree, dirname):
            for name, mode, id in tree.iteritems():
                if name == dirname:
                    obj = self.repository._repo[id]
                    if isinstance(obj, objects.Tree):
                        return obj
                    else:
                        raise RepositoryError("Cannot create directory %s "
                        "at tree %s as path is occupied and is not a "
                        "Tree" % (dirname, tree))
            return None

        trees = []
        parent = root_tree
        for dirname in dirs:
            tree = get_tree_for_dir(parent, dirname)
            if tree is None:
                tree = objects.Tree()
                dirmode = 040000
                parent.add(dirmode, dirname, tree.id)
                parent = tree
            # Always append tree
            trees.append(tree)
        return trees