avy-copy-* and avy-move-* fail with "wrong type argument: integer-or-marker-p" on C-g

[minad]

If aborting these commands, they fail. Probably this error should be caught or even better, an integer-or-marker-p check should be added before the offending lines. This is similar to #314. @abo-abo Do you want me to fix these too? These are obviously not critical errors but I usually expect packages to not throw errors but rather print messages instead.