Fix: TOC helper would raise an exception if it was called with content that doesn’t contain any headings.
Merge pull request #424 from aexmachina/toc-with-no-headings

Fix: TOC helper would raise an exception if it was called with content that doesn’t contain any headings.
Merge branch 'master' into dev
Remove swig plugins
Fix list_archives helper #421
Fix #426
Update dependencies #425
Fix useless <br> tags in markdown #422
2.4.3 release
Merge branch 'dev'
fixed