fixes for calculating metabolic distance
fixes for calculating metabolic distance

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