Improve countValuesWhereOpConditions method in DataCategory

[brindakv]

Improve countValuesWhereOpConditions method (and other methods if relevant) in DataCategory by adding a break when conditions are False in order to increase efficiency.

See comment and discussion below:
I'm noticing now that you have this break here whereas the other methods don't (e.g., countValuesWhereOpConditions). Should we add this to those other ones too? Seems like a logical efficiency to me, versus wasting time iterating over things once it's False.

Originally posted by @piehld in #36 (comment)