Fix statistics for empty collections and exercises without submissions
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@ -13,7 +13,12 @@ class ExerciseCollection < ActiveRecord::Base
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end
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def average_working_time
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exercise_working_times.values.reduce(:+) / exercises.size
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if exercises.empty?
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0
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else
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values = exercise_working_times.values.reject { |v| v.nil?}
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values.reduce(:+) / exercises.size
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end
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end
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def to_s
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