Don't redirect errors to /dev/null and don't return true(1)
unconditionally. Instead, don't check for the existence of index.theme.
This will allow us to catch errors that may be happening because of a
missing dependency in the chain.
Some hidden issues may appear, in which case please contact me.
discussed with and ok blind jasper@
Gtk viewer for Microsoft HTML Help (aka "CHM", Compiled HTML) files
using chmlib and Mozilla's gecko engine.
Based on a submission from Jiri B. with some tweaks.
