lyx2lyx error: IndexError: list index out of range

[Scott Kostyshak]

On current master, for the Russian UserGuide, I get:

$ lyx -e lyx23x UserGuide.lyx 
starting local cmake binary for lyx
lyx2lyx warning: An error occurred in 565, <function revert_hebrew_parentheses at 0x7f42468c5510>
Traceback (most recent call last):
  File "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/lyx2lyx", line 97, in <module>
    main()
  File "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/lyx2lyx", line 91, in main
    doc.convert()
  File "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/LyX.py", line 702, in convert
    conv(self)
  File "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/lyx_2_4.py", line 1547, in revert_hebrew_parentheses
    convert_hebrew_parentheses(document)
  File "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/lyx_2_4.py", line 1540, in convert_hebrew_parentheses
    elif current_languages[-1] == 'hebrew' and not line.startswith('\\'):
IndexError: list index out of range
support/Systemcall.cpp (306): Systemcall: 'python3 -tt "/home/scott/lyxbuilds/master-master/repo/lib/lyx2lyx/lyx2lyx" -V 2.3 -o "UserGuide.23.lyx" "UserGuide.lyx"' finished with exit code 1
Error: Cannot convert file
----------------------------------------
An error occurred while running:
python3 -tt $$s/lyx2lyx/lyx2lyx -V 2.3 -o "UserGuide.23.lyx" "UserGuide.lyx"
1$ 

The ctests started to fail because of this at 6741a8fb, although I think
that commit just triggered this lyx2lyx issue.

Scott
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