crash bug in pinyin tone marking support

[Richard Tew]

I have a card like so:

Question half:

What is something or other?

Answer half:

1) ....
2) ....
3) ....

Any cards I have that have 1) 2) .. crash because isrs cannot deal
with it.

Also, when viewing in the default mode (non full screen) , tone
markings are not translated in the question section when a new card
comes up. If the screen is refreshed, i think by going into settings
and back, they are. Answer section works fine.

Thanks for adding this, but i've had to redo about 100 cards 4x today
because of it :-)

Cheers, Richard.

[Richard Tew]

Forgot to explicitly say, this is related to switching on tone
markings :)