fixes for calculating metabolic distance
fixes for calculating metabolic distance

kbase/KBaseFBAModeling,scanon/KBaseFBAModeling,scanon/KBaseFBAModeling,scanon/KBaseFBAModeling,kbase/KBaseFBAModeling,kbase/KBaseFBAModeling,scanon/KBaseFBAModeling,scanon/KBaseFBAModeling,kbase/KBaseFBAModeling,kbase/KBaseFBAModeling