[tex4ht] split environment and exerquiz package

[Michal Hoftich]

Hi Tomáš,

>Ok, thanks, so let's try to solve each problem separately. Please find 
>attach a simple example of split environment. The tex-file is ok, but 
>make4  -a debug split_ex.tex gives the error message
>
>Can you please have a look? Any hint is appreciated.
>
I've added fix for this issue to TeX4ht sources. Thanks for the report.

Best regards,
Michal