towncrier renders with `trim_blocks=True` which trims the newline at the
start of the for loop's body. This adds an additional newline which is
not trimmed, which ensures that the code blocks don't blend into each
other.
It looks like towncrier unconditionally writes top_line
when it is defined in the title_format configuration.
So we must not repeat it in the template.
When running towncrier with --draft, it works differently
so in that case the top line is not shown...
This allows sphinxcontrib-towncrier to render it in the documentation.
The rendering of NEWS.rst is unchanged since Towncrier detects
automatically if that line exists and does not render a duplicated
section title.
Pradyun Gedam
Stéphane Bidoul
Tzu-ping Chung