@snarkophilus - I've made a change for the next version which will do as you suggest of aborting calculating statistics for that particular book and printing why in the log. In that situation you displayed it would still store a page count, but it would leave any other word count or readability statistics untouched. So if you haven't yet set a value, they will stay blank, and if it already has a value, that will stay as it is.
I'll hold off on releasing the change for a few days to see if anything else comes up.
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