Bug#403641: tetex-base: postrm fails if just unpackaged.

[Florent Rougon <f.rougon@free.fr>]

In fact, this problem is taken care of by the dh_installtex snippets,
and the approach is closer to "ignore errors but display a warning" than
to "run the commands iff tex-common is configured, not ignoring errors":

,----[ From lmodern's current postrm ]
| case "$1" in
|     remove|disappear)
|         dhit_check_run_without_errors -silent update-updmap --quiet
|         dhit_check_run_without_errors -silent update-language
|         dhit_check_run_without_errors -silent update-fmtutil
|         if dhit_libkpathsea_configured; then
|             dhit_check_run_without_errors mktexlsr
|         fi
|         for i in map ; do
|             if [ "$i" = map ] ; then
|                 dhit_libkpathsea_configured && \
|                     dhit_check_run_without_errors updmap-sys
|             fi
|             if [ "$i" = format ] ; then
|                 for fmt in  ; do
|                     rm -f /var/lib/texmf/web2c/$fmt.*
|                 done
|             fi
|             if [ "$i" = language ] ; then
|                 if dhit_libkpathsea_configured && \
|                     which fmtutil-sys >/dev/null; then
|                     dhit_build_hyphen_format_if_format_exists \
|                         latex $(kpsewhich language.dat)
|                 fi
|             fi
|         done
|     ;;
`----

Maybe tetex-base should do the same, or something similar.

-- 
Florent