Do not throw error if alternativas have data that can lead to negative numbers for probability calculation - #703
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…can lead to negative numbers
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We stumbled on situation at work where we had a completed_count greater than participant_count.
When calculating the probability this can lead to negative numbers which are not valid input for Beta Distribution. So RubyStats throws an error right away.
I still need more info on when/how this happens. But the Dashboard should not blow up in any case because of this. So I'm adding this check.