comark/tests/missing-report · Give every ::tests a src or an XML fence

::tests shows a JUnit report, read from the file in src or from one xml fence inside the block. With neither, it has nothing to count and renders nothing.

Incorrect

::tests{title="Pond tests"}
::

lint-comark example.mdexample.md:1:1 comark/tests/missing-report::tests 1: src is required.Write ::tests{src="junit.xml"}, or put the report in an ```xml fence inside the block.✖ 1 problem

Correct

::tests{src="junit.xml" title="Pond tests"}
::

lint-comark example.md✔ No problems