Returns true if a BreakdownSet contains no entries. If there are any Breakdowns in the set even if they contain no values this function will return false. This is a useful function when developing new KPI formula as it can be used for simple debug logging.  

var issues = metrics.get('critical issues').getLatest(); 

if (issues.breakdown().isEmpty()){

   console.log('No breakdown data for critical issues for date: %s',

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