Add extension errors that stop the build

from typing import Any, Dict, List

from sphinx import addnodes

from sphinx.util import logging

from sphinx.errors import SphinxError

class TableFromList(SphinxDirective):

    has_content = True

        if len(node.children) != 1 or not isinstance(node.children[0],

                                                     nodes.bullet_list):

            reporter = self.state.document.reporter

            return [reporter.warning('.. table_from_list content is not a list', line=self.lineno)]

            raise SphinxError('table_from_list content is not a list')

        fulllist = node.children[0]

        if (len(fulllist) % ncolumns) != 0:

            raise SphinxError('number of list elements not a multiple of column number')

        table = nodes.table()

        tgroup = nodes.tgroup(cols=ncolumns)

        table += tgroup