[O] [PATCH] ox-md.el: fixed an issue where exporting markdown ToC would fail if heading numbering is not enabled

[Yue Zhu]

When exporting markdown with ToC, if heading numbering is not enabled, it
would fail with the attached backtrace. The cause is that the function
`org-md--build-toc' in `ox-md.el' does not properly handle this case which
effectively results in a function call `(format "%d." nil)'. In my patch,
when exporting markdown with ToC, if heading numbering is not enabled, ToC
will be shown as an unordered list.

0001-ox-md.el-fixed-an-issue-where-exporting-markdown-ToC.patch
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backtrace.log

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