Blank line before header at top of document

[njbart]

Pandoc not only allows but requires a blank line before a header.

However, if the first line of a document is a blank line, followed by a header, the header is not recognized.

Using just the command pandoc test.md,

# Heading

Text text text.

produces

<p># Heading One</p>
<p>Text text text.</p>

After removing the first blank line, the result is, as expected,

<h1 id="heading">Heading</h1>
<p>Text text text.</p>