[tex4ht] Bold index entries

[Karl Berry]

    ! Undefined control sequence.
    l. 114	\item dragon, \hyperindexformat {\textbf}{15}, \hyperpage{15}

It's hard to guess what the undefined control sequence is from that,
but as an ugly workaround, it seems like either
\def\hyperindexformat{}
or
\def\hyperpage{}
could at least get rid of the error without changing anything else.

Also {\textbf}{15} doesn't look right. Unless the code somewhere has
redefined \textbf (which I guess maybe it has), that gives an error:
! Argument of \textbf  has an extra }.

It needs to be just \textbf{15} for normal LaTeX to apply.

Just a couple of random thoughts :). --best, karl.