I was working with some contrib code which was sending an empty value to html2text.php. As a result, the following notice was produced:

Notice: Uninitialized string offset: 0 in /home/arborrow/Moodle/code/19stable/lib/html2text.php on line 39

I am attaching a diff file that gets around the notice; however, I'm not sure if setting $chr to an empty string is the best thing. But I think verifying that there is something there to work with in $badStr

is a good idea.

Peace - Anthony