Error transducer has weird behaviour with lttoolbox

[ftyers]

Some extra strings seem to be added to the transducer, e.g. Татарстан<np><top><attr><err_orth> which is not in the original.

$ echo "татарстан" | lt-proc tat.automorf.bin  | tr '/' '\n'
^татарстан
Татарстан<np><top><attr><err_orth>
Татарстан<np><top><nom><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><pl><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><sg><err_orth>$

$ echo "Татарстан" | lt-proc tat.automorf.bin  | tr '/' '\n'
^Татарстан
Татарстан<np><top><attr>
Татарстан<np><top><nom>
Татарстан<np><top><attr><err_orth>
Татарстан<np><top><nom><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><pl>
Татарстан<np><top><nom>+и<cop><aor><p3><sg>
Татарстан<np><top><nom>+и<cop><aor><p3><pl><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><sg><err_orth>$

Compare to hfst-lookup:

$ hfst-lookup tat.automorf.hfst 
татарстан
татарстан	Татарстан<np><top><attr><err_orth>	0,000000
татарстан	Татарстан<np><top><nom><err_orth>	0,000000
татарстан	Татарстан<np><top><nom>+и<cop><aor><p3><pl><err_orth>	0,000000
татарстан	Татарстан<np><top><nom>+и<cop><aor><p3><sg><err_orth>	0,000000

Татарстан
Татарстан	Татарстан<np><top><attr>	0,000000
Татарстан	Татарстан<np><top><nom>	0,000000
Татарстан	Татарстан<np><top><nom>+и<cop><aor><p3><pl>	0,000000
Татарстан	Татарстан<np><top><nom>+и<cop><aor><p3><sg>	0,000000

Note that this doesn't happen with lt-proc -c:

$ echo "татарстан" | lt-proc -c tat.automorf.bin  | tr '/' '\n'
^татарстан
Татарстан<np><top><attr><err_orth>
Татарстан<np><top><nom><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><pl><err_orth>
Татарстан<np><top><nom>+и<cop><aor><p3><sg><err_orth>$

$ echo "Татарстан" | lt-proc -c tat.automorf.bin  | tr '/' '\n'
^Татарстан
Татарстан<np><top><attr>
Татарстан<np><top><nom>
Татарстан<np><top><nom>+и<cop><aor><p3><pl>
Татарстан<np><top><nom>+и<cop><aor><p3><sg>$

Although of course with lt-proc -c, other case forms won't work.

The extra strings can be easily removed with some CG rules for the <err_orth> tag, but they are undesirable for the model in general.