Links without text should be discarded

[bilogic]

Hi there!

$html = "<a href='http://a.com'></a><a href='http://b.com'></a>";
dd(\Soundasleep\Html2Text::convert($html));

Produces http://a.comhttp://b.com, which produces incorrect HTML if placed through a markdown parser or auto link parser.
I think the output should be one of the following, preferring the ones first mentioned

1. [](http://a.com)[](http://b.com)
2. Totally empty
3. http://a.com http://b.com , additional space after each link