TexinfoTranslator won't allow section name of .

[brandonwillard]

Subject: TexinfoTranslator won't allow section name of .

Problem

• TexinfoTranslator.escape_id strips . from possible node names.

Procedure to reproduce the problem

> cd /tmp
> yes n | sphinx-quickstart -p test -a test --dot _ -v 0 -r 0 -l rst --master index --suffix .rst --makefile ./
> echo "\n.\n-\n\nThis is a subsection with a ``.`` as the title." >> index.rst
> make info

Error logs / results

Running Sphinx v1.8.3
loading translations [rst]... not available for built-in messages
making output directory...
building [mo]: targets for 0 po files that are out of date
building [texinfo]: all documents
updating environment: 1 added, 0 changed, 0 removed
reading sources... [100%] index                                                                          
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
processing test.texi...index 
resolving references...
writing... 
Exception occurred:
  File "/home/bwillard/apps/anaconda3/lib/python3.6/site-packages/sphinx/writers/texinfo.py", line 309, in collect_node_menus
    assert 'node_name' in node and node['node_name']
AssertionError
The full traceback has been saved in /tmp/user/1000/sphinx-err-hqoqrlb7.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
make: *** [Makefile:19: info] Error 1

Expected results

Should produce a test.info file containing the following:

@menu
* .:: 

@end menu

@node .,,,Indices and tables
@anchor{index id1}@anchor{3}
@chapter .


This is a subsection with a . as the title.

Reproducible project / your project

• Documentation texinfo build fails hylang/hy#1717

Environment info

• OS: Ubuntu 18.10
• Python version: Python 3.6.7 :: Anaconda, Inc.
• Sphinx version: 2.0.0+/58f4c658f
• texi2any (GNU texinfo) 6.5

[tk0miya]

Fixed by #6007.
Thanks,